var emailFilter=/^.+@.+\..{2,3}$/;
var num=/^([0-9])+$/;

function login(){

if (document.gui.name.value== "")
{
alert ("Please enter your good name");
document.gui.name.focus();
return false;
}
if (document.gui.email.value=="")
{
alert ("plese fill your email id")
document.gui.email.focus();
return false;
}
if (!emailFilter.test(document.gui.email.value)){
alert ("Invalid Email address");
document.gui.email.focus();
return false;
}
if (document.gui.comment.value== "")
{
alert ("Please enter your comment");
document.gui.comment.focus();
return false;
}}