function checkemail(){
	var testresults
	var str=document.userdata.email.value
	var filter=/^.+@.+\..{2,4}$/
	if (filter.test(str))
		testresults=true
	else {
		alert("Please input a valid email address!");
		userdata.email.focus();
		testresults=false;
	}
	return (testresults)
}

function checkbae(){
	if (document.layers||document.all) {
		return checkemail();
	} else return true;
}