function on (id, img)
{
	document.getElementById(id).background = "/images/menu_bg_on.gif";
	eval(img+".src = '/images/menu_strelka.gif';");
}
function out (id, img)
{
	document.getElementById(id).background = "/images/menu_bg.gif";
	eval(img+".src = '/images/dot.gif';");
}