function validate(id,email,subject,message) {
	
  var reg = /^([A-Za-z0-9_\-\.]+)\@([A-Za-z0-9_\-\.]+)\.([A-Za-z]+)$/gi;
  var address = document.forms[id].elements[email].value;

   if(reg.test(address)!==true) {
	  alert('Invalid Email Address');
	  return false;
   } 
   var sub = document.forms[id].elements[subject].value;
   if(sub == ''){
		alert('Please enter subject');
		return false;
   }
   var mess = document.forms[id].elements[message].value;
	if(mess == '' || mess == ' ' || mess == ' '){
		alert('Please enter message');
		return false;
   }
}