function validate_required(field,alerttxt){
  with (field){
	if (value==null||value=="")  {
	  alert(alerttxt);return false;
	} else {
	  return true;
	}
  }
}
function validate_email(field,alerttxt){
with (field)  {
	  apos=value.indexOf("@");
	  dotpos=value.lastIndexOf(".");
	  if (apos<1||dotpos-apos<2){alert(alerttxt);return false;}
	  else {return true;}
  }
}

function validate(thisform){
	with (thisform){
		if(validate_required(fullname,"Please enter your name.")==false){ fullname.focus(); return false; }
		if(validate_email(email,"Please enter your email address.")==false){ fullname.focus(); return false; }
	}
}