function im_preload(img_obj,img_src){
  if(document.images){
  		eval(img_obj+'=new Image()');
  		eval(img_obj+'.src="'+img_src+'"');
		};
};


function zmen(img_id, img_src) {
	if(document.images) {
		document.images[img_id].src = img_src;
	}
}

im_preload("sipka_zluta","images/sipka_zlutab.jpg");
im_preload("more","images/moreb.jpg");
im_preload("links","images/linksb.jpg");
im_preload("go_modra","images/go_modrab.jpg");
im_preload("go_zelena","images/go_zelenab.jpg");