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;
   apos=document.forms[form_id].elements[email].value.indexOf("@");
   dotpos=document.forms[form_id].elements[email].value.lastIndexOf(".");
   if (document.forms[form_id].elements[email].value == "" || apos<1 || dotpos-apos<2)
   {
	   alert('Invalid Email Address');
		document.forms[form_id].email.focus();
		return false
   }
   else if(reg.test(address) == false) {
	   	alert('Invalid Email Address');
	   	document.forms[form_id].email.focus();
	   	return false;
   }
    return true;	  
}