var capaClic;
  capaClic=0;
  
  function verArea(id){  
    if(capaClic==0){
	 document.getElementById(id).style.visibility="visible";
     capaClic=1;
	}else{
	 document.getElementById(id).style.visibility="hidden";
     capaClic=0;
	}
  }

  var popUpWin=0;
  function popUpWindow(URLStr, left, top, width, height)
  {
    if(popUpWin)
    {
      if(!popUpWin.closed) popUpWin.close();
    }
    popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
  }