var emailfilter=/^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,4}|\d+)$/i

function validateEmail(e){
	var returnval=emailfilter.test(e.value)
	if (returnval==false){
		alert("Please enter a valid email address.")
		e.select()
	}
	return returnval
}