var email = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
var submittable = true;
function chkForm(theform){

	em = document.getElementById("email");
	
	text = em.value;
	result = email.test(text);
	if(result==false){
		submittable=false;
		document.getElementById("email_warn").className="warn";
		document.getElementById("email_warn").innerHTML="Please enter a valid email address";
	}
	else{
		document.getElementById("email_warn").className="warnEmpty";
		document.getElementById("email_warn").innerHTML="";
		submittable=true;
	}
	return submittable;

}