Java Script for 'email' validation

This is function for validate the email enter by user.

It return true if email address is right or

false if entered mail is not in proper way. 

\\ Email Validation

function validate(form_id,email) {
 
var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\

            .([A-Za-z]{2,4})$/;
var address = document.forms[form_id].elements[email].value; 
   if(reg.test(address) == false) {
      alert('Invalid Email Address');
      return false; 

}

else return true;
}