$(document).ready(
function()
{
	function mouse_over (ref) {
		if (!ref.hasClass('marked')) {
			var src = ref.attr("src");
			src = src.slice (0, -4);
			ref.attr("src", src+"_over.jpg");
		};
	};
	
	function mouse_out (ref) {
		if (!ref.hasClass('marked')) {
			var src = ref.attr("src");
			src = src.slice (0, -9);
			ref.attr("src", src+".jpg");
		};
	};
	
	function ustaw_pierwsze (ref) {
		if (ref.hasClass('marked')) {
			var markedSrc = ref.attr("src");
			markedSrc = markedSrc.slice (0, -4);
			markedSrc = markedSrc+"_over.jpg";
			ref.attr("src", markedSrc);
			//alert (markedSrc);
		};
	};
	
	$(".logo_menu .menu a .marked").attr ("src", function () {
		var markedSrc = this.src;
		markedSrc = markedSrc.slice (0, -4);
		markedSrc = markedSrc+"_over.jpg";
		return markedSrc;
	});
	

	$(".logo_menu .menu a img").mouseover (
	function () 
	{
		mouse_over($(this));
	});
	
	$(".logo_menu .menu a img").mouseout (
	function () 
	{
		mouse_out($(this));
	});
});