window.onload=preLoadImg;
function preLoadImg(){
	  if (document.images) {
		  img1 = new Image();
		  img1.src = "media/layout/meniu_left_back_on.jpg";
		  img2 = new Image();
		  img2.src = "media/layout/meniu_left_bul_on.jpg";
	  }
	
}