function checkmail(){
result=true
var x = document.getElementById("email").value
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(x)) {
	alert("Incorrect email address format")
	result=false
	document.getElementById("email").value =""
	
	}
return result
}