function validateEmail(email) {
	var re = /^([\.a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
   var flag =  re.test(email);
   if ( !flag ) {
   	alert ("The email address given:\n"
      	+ email + " \nhas a typo."
      	+ "\nPerhaps the  @  or  .(dot)   or  .com  are missing.");
   }
   return flag;
}