<form onsubmit="serverconnect('Div1', 'query.php'); return
false;"
Minimum Discount: <br />
<input type="radio" value="20%" name="discount" /> 20% <br />
<input type="radio" value="15%" name="discount" /> 15% <br />
<input type="radio" value="10%" name="discount" /> 10% <br />
<input type="radio" value="5%" name="discount" /> 5% <br />
<input type="submit" value="Refine Search" />
</form>

<script language="javascript" type="text/javascript">


var xmlhttp = false;


if (window.XMLHttpRequest)
{
    xmlhttp = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}


function serverconnect(divID, datalocation)
{
var1=$clickvalue;
if(xmlhttp)
{
    var obj = document.getElementById(divID);
    xmlhttp.open("GET", datalocation);

    xmlhttp.onreadystatechange = function()
    {
        if (xmlhttp.readyState == 4 &&
        xmlhttp.status == 200)
        {
        obj.innerHTML = xmlhttp.responseText;
        }
    }
    xmlhttp.send(null);
}

}
</script>

<input type="radio" value="20%" name="discount" id="discount" /> 20% <br />


var obj = document.getElementById(divID);
var disc = document.getElementById("discount");
xmlhttp.open("GET", datalocation + "?disc="+disc);