function main_menu_change($id, $link, $bkColor, $color)	{
		document.getElementById($id).style.backgroundColor = $bkColor;
		document.getElementById($link).style.color = $color;
	}
	
	function main_menu_changebk($id, $link, $bkColor, $color)	{
		document.getElementById($id).style.backgroundColor = $bkColor;
		document.getElementById($link).style.color = $color;
	}