var position=30;
function Toggle(item) {
   obj=document.getElementById(item);
   visible=(obj.style.display!="none")
   key="x" + item;
   if (visible) {
     obj.style.display="none";
     document.images[key].src="slike/YouTube1.gif";
   } else {
      obj.style.display="block";
      document.images[key].src="slike/YouTube2.gif";
   }
}