// JavaScript Document
<script language="javascript" type="text/javascript">
function checkemail(){
 var str=document.coform.email.value
 var filter=/^.+@.+\..{2,3}$/

 if (filter.test(str))
    testresults=true
 else {
    alert("Please provide a valid email address.")
	document.coform.email.focus();
    testresults=false
}
 return (testresults)
}
function form_validation(){
var img_error = "";

var hd = document.coform;
	if(hd.Name.value == ""){
			alert("Please enter your name.");
			hd.Name.focus();
			return false;
		}

		if(hd.email.value == ""){
			alert("Please enter email address.");
			hd.email.focus();
			return false;
		}
		return checkemail()
//////////////////////////////////
		return true;
	}
</script>