function SignUp()
{
if(!empty($_POST['user']))   //checking the 'user' name which is from Sign-Up.html, is it empty or have some text
{
	$query = mysql_query("SELECT * FROM websiteusers WHERE userName = '$_POST[user]' AND pass = '$_POST[pass]'") or die(mysql_error());

	if(!$row = mysql_fetch_array($query) or die(mysql_error()))
	{
		newuser();
	}
	else
	{
		echo "SORRY...YOU ARE ALREADY REGISTERED USER...";
	}
}