Need numeric validation for a field in a form

[satyasampan]

i need to validate the form .. fields should not be empty is justified... but the last field i.e var z should be numeric ..please reply fast

function validateform()
{
var x=document.getElementById("nameid").value;
if(x==''){alert("name should not be empty");return false;}
var y=document.getElementById("qualificationid").value ;
if(y==''){alert("qualification should not be empty");return false;}
var z=document.getElementById("rollnumid").value;
if(z==''){alert("rollnum should not be empty");return false;}
}

[gits]

you might use the isNaN method for that check

[ariful alam]

@satyasampan, you should have a look @ the following link

http://bytes.com/topic/php/answers/942389-validate-numeric-entry#post3725937

Hope works for you. :)