Untitled

<html>
        <head>
                <title>Dikhoofd's BR heal speed calculator</title>
        </head>
        <body>
                Criminals in BR: <input id="c" value="0" onkeypress="handleEnter(this, event)"/>
                        <br>
                Cops in BR: <input id="d" value="0" onkeypress="handleEnter(this, event)"/>
                <button onclick="myFunction()">Calculate</button>
                <p id="demo"></p>
<script>
        function myFunction()
        {
        d1=document.getElementById("d").value;
        c1=document.getElementById("c").value;
		e1=document.getElementById("e").value;
		f1=document.getElementById("f").value;
		var a;
		var e1=e2;
		var f1=f2;
        var c2=c1;
        var d2=d1;
        var c=c2/10*10;
        var d=d2/10*10;
		var e=e2/10*10
		var f=f2/10*10
        var a=c+d;
		var e=c/a*30
		var f=d/a*30
        var demoP=document.getElementById("demo")

if (c<=999999999999999999 && c>=0 && d<=9999999999999999999 && d>=0)
        {
        demoP.innerHTML="Hp healed per second cop= " + e + "hp/s. for criminal" + f + "hp/s";
}
        else if (d>=)10000000000000000000
        {
        alert("Why would you want to know a number that high")
}
        else if (c>=0)
        {
        alert("Please enter two numbers greater than 0.")
}
        else if (c>=1000000000000000000 || c<=-1 || d>=100000000000000000000 || d<=-1)
        {
        alert("Why do you want to know that?")
}

        else
        {
        alert("You can only enter a number.")
}
}

function handleEnter(inField, e) {
    var charCode;

    if(e && e.which){
        charCode = e.which;
    }else if(window.event){
        e = window.event;
        charCode = e.keyCode;
    }

    if(charCode == 13) {
myFunction()
    }
}
</script>
</body>
</html>