function validateForm()
{
    var tubemat = document.getElementById("tubemat").value;
    var diameter = document.getElementById("diameter").value;
    var medium = document.getElementById("medium").value;
    var agressi = document.getElementById("agressi").value;
    var omgeving = document.getElementById("omgeving").value;

    var run = 1;
    var materials = new Array();
    var diameterA = new Array();
    var split = new Array();
    var mats = new Array();
    var mats2 = new Array();
    var mats3 = new Array();
    var mats4 = new Array();
    var mats5 = new Array();
    var bar;

    //Material, tubematerial, diameter, medium, agressiveness, omgeving

    materials[0] = "PVDF,Plastics,4^6^8^10^12^15^16,Air^Gases^Liquid^Oil,Aggressive^Slightly aggressive^Non-aggressive,Corrosive^Non-corrosive";
    materials[1] = "PA,Plastics,6^8^10^12,Air^Gases,Non-aggressive,Non-corrosive";
    materials[2] = "Flip,Plastics,4^6^8^10^12,Air,Non-aggressive,Non-corrosive";
    materials[3] = "Brass M,Non-ferrous metals^Plastics,2^3^4^6^8^10^12^15^18^22^28^30^35,Air^Gases^Liquid^Oil,Non-aggressive,Non-corrosive";
    materials[4] = "Brass G,Non-ferrous metals^Plastics,4^6^8^10^12^15,Air^Gases^Liquid^Oil,Non-aggressive,Non-corrosive";
    materials[5] = "Brass chem. nickel-plated,Non-ferrous metals^Stainless steel^Plastics,4^6^8^10^12^15^18,Air^Gases^Liquid^Oil,Slightly aggressive^Non-aggressive,Non-corrosive";
    materials[6] = "Stainless Steel,Stainless steel^Plastics,2^3^4^5^6^8^10^12^15^18^22^28,Air^Gases^Liquid^Oil,Aggressive^Slightly aggressive^Non-aggressive,Corrosive^Non-corrosive";
    materials[7] = "Steel,Steel^Plastics,6^8^10^12^15^18^22^28,Air^Gases^Liquid^Oil,Slightly aggressive^Non-aggressive,Non-corrosive";

    //mindia-maxdia,bar^mindia-maxdia,bar^mindia- etc etc
    diameterA["PVDF"] = "4-16,10^";
    diameterA["PA"] = "6-12,10^";
    diameterA["Flip"] = "4-12,10^";
    diameterA["Brass M"] = "2-6,125^6-8,250^8-10,150^10-12,100-125^12-18,40^18-22,25^22-35,16";
    diameterA["Brass G"] = "4-8,125^8-12,100^12-15,64";
    diameterA["Brass chem. nickel-plated"] = "4-6,100^6-8,200^8-10,125^10-12,80^12-18,25";
    diameterA["Stainless Steel"] = "2-5,250^5-8,200^8-12,160^12-18,100^18-22,64^22-28,40";
    diameterA["Steel"] = "6-8,400^8-10,300^10-12,250^12-18,200^18-28,160";

    if(run == 1)
    {
        for(var i = 0; i < materials.length; i++)
        {
            split = materials[i].split(",");
            splittubemat = split[1].split("^");

            if(tubemat != "Unknown")
            {
                for(var it = 0; it < splittubemat.length; it++)
                {
                    if(splittubemat[it] == tubemat)
                    {
                        mats.push(materials[i]);
                    }
                }
            }
            else
            {
                mats.push(materials[i]);
            }
            if(i == materials.length-1)
            {
                if(mats.length > 0)
                {
                    //alert("materials checked "+mats.length+" materials found");

                    for(i = 0; i < mats.length; i++)
                    {
                        split = mats[i].split(",");
                        splitdia = split[2].split("^");

                        if(diameter != "Unknown")
                        {
                            for(var id = 0; id < splitdia.length; id++)
                            {
                                if(splitdia[id] == parseInt(diameter))
                                {
                                    mats2.push(mats[i]);
                                }
                            }
                        }
                        else
                        {
                            mats2.push(mats[i]);
                        }
                        if(i == mats.length-1)
                        {
                            if(mats2.length > 0)
                            {
                                //alert("diameters checked "+mats2.length+" materials found");

                                for(i = 0; i < mats2.length; i++)
                                {
                                    split = mats2[i].split(",");
                                    splitmediums = split[3].split("^");

                                    if(medium != "Unknown")
                                    {
                                        for(var im = 0; im < splitmediums.length; im++)
                                        {
                                            if(splitmediums[im] == medium)
                                            {
                                                mats3.push(mats2[i]);
                                            }
                                        }
                                    }
                                    else
                                    {
                                        mats3.push(mats2[i]);
                                    }
                                    if(i == mats2.length-1)
                                    {
                                        if(mats3.length > 0)
                                        {
                                            //alert("mediums checked "+mats3.length+" materials found");

                                            for(i = 0; i < mats3.length; i++)
                                            {
                                                split = mats3[i].split(",");
                                                splitagressi = split[4].split("^");

                                                if(agressi != "Unknown")
                                                {
                                                    for(var ia = 0; ia < splitagressi.length; ia++)
                                                    {
                                                        if(splitagressi[ia] == agressi)
                                                        {
                                                            mats4.push(mats3[i]);
                                                        }
                                                    }
                                                }
                                                else
                                                {
                                                    mats4.push(mats3[i]);
                                                }
                                                if(i == mats3.length-1)
                                                {
                                                    if(mats4.length > 0)
                                                    {
                                                        //alert("agressiveness checked "+mats4.length+" materials found");

                                                        for(i = 0; i < mats4.length; i++)
                                                        {
                                                            split = mats4[i].split(",");
                                                            splitomg = split[5].split("^");

                                                            if(omgeving != "Unknown")
                                                            {
                                                                for(io = 0; io < splitomg.length; io++)
                                                                {
                                                                    if(splitomg[io] == omgeving)
                                                                    {
                                                                        mats5.push(mats4[i]);
                                                                    }
                                                                }
                                                            }
                                                            else
                                                            {
                                                                mats5.push(mats4[i]);
                                                            }
                                                            if(i == mats4.length-1)
                                                            {
                                                                if(mats5.length > 0)
                                                                {
                                                                    //alert("environment checked "+mats5.length+" materials found");

                                                                    document.getElementById("result").innerHTML = "Material(s): ".bold();

                                                                    for(i = 0; i < mats5.length; i++)
                                                                    {
                                                                        split = mats5[i].split(",");
                                                                        splitdia2 = diameterA[split[0]].split("^");

                                                                        if(diameter != "Unknown")
                                                                        {
                                                                            for(ib = 0; ib < splitdia2.length; ib++)
                                                                            {
                                                                                splitdia3 = splitdia2[ib].split(",");
                                                                                splitdia4 = splitdia3[0].split("-");

                                                                                if(parseInt(diameter) >= parseInt(splitdia4[0]) && parseInt(diameter) < parseInt(splitdia4[1]))
                                                                                {
                                                                                    bar = splitdia3[1];
                                                                                }
                                                                            }
                                                                        }
                                                                        else
                                                                        {
                                                                            bar = 0;
                                                                        }

                                                                        document.getElementById("result").innerHTML += (split[0]+"("+bar+" bar)"+", ").bold();

                                                                        if(i == mats5.length-1)
                                                                        {
                                                                            run = 0;
                                                                            split = [];
                                                                            mats = [];
                                                                            mats2 = [];
                                                                            mats3 = [];
                                                                            mats4 = [];
                                                                            mats5 = [];
                                                                        }
                                                                    }
                                                                }
                                                                else if(run == 1)
                                                                {
                                                                    run = 0;
                                                                    split = [];
                                                                    mats = [];
                                                                    mats2 = [];
                                                                    mats3 = [];
                                                                    mats4 = [];
                                                                    mats5 = [];

                                                                    document.getElementById("result").innerHTML = "Material(s): ".bold();

                                                                    alert("Couldn`t find any materials.");
                                                                }
                                                            }
                                                        }
                                                    }
                                                    else if(run == 1)
                                                    {
                                                        run = 0;
                                                        split = [];
                                                        mats = [];
                                                        mats2 = [];
                                                        mats3 = [];
                                                        mats4 = [];
                                                        mats5 = [];

                                                        document.getElementById("result").innerHTML = "Material(s): ".bold();

                                                        alert("Couldn`t find any materials.");
                                                    }
                                                }
                                            }
                                        }
                                        else if(run == 1)
                                        {
                                            run = 0;
                                            split = [];
                                            mats = [];
                                            mats2 = [];
                                            mats3 = [];
                                            mats4 = [];
                                            mats5 = [];

                                            document.getElementById("result").innerHTML = "Material(s): ".bold();

                                            alert("Couldn`t find any materials.");
                                        }
                                    }
                                }
                            }
                            else if(run == 1)
                            {
                                run = 0;
                                split = [];
                                mats = [];
                                mats2 = [];
                                mats3 = [];
                                mats4 = [];
                                mats5 = [];

                                document.getElementById("result").innerHTML = "Material(s): ".bold();

                                alert("Couldn`t find any materials.");
                            }
                        }
                    }
                }
                else if(run == 1)
                {
                    run = 0;
                    split = [];
                    mats = [];
                    mats2 = [];
                    mats3 = [];
                    mats4 = [];
                    mats5 = [];

                    document.getElementById("result").innerHTML = "Material(s): ".bold();

                    alert("Couldn`t find any materials.");
                }
            }
        }
    }
}