function opis(evt,id,x,y)
  {
   if (window.pageYOffset != null)
   {
    var sy = window.pageYOffset;
   }
   if (document.body.scrollWidth != null)
   {
    var sy = document.body.scrollTop;
   }
   if (window.pageXOffset != null)
   {
    var sx = window.pageXOffset;
   } 
   if (document.body.scrollHeight != null)
   {
    var sx = document.body.scrollLeft;
   }
   var dx = x;
   var dy = y;
   var cx = evt.x + dx + sx;
   var cy = evt.y + dy + sy;
   document.all[id].style.left = cx;
   document.all[id].style.top = cy;
   document.all[id].style.visibility = 'visible';
  }