function changeBackground(id,picture){
	 newImage = "url("+picture+")";
     document.getElementById(id).style.backgroundImage = newImage;	
}
function changeImage(id,picture){
	
     document.getElementById(id).src= picture;	
}

var popUpWin=0;
function popUpWindow(URLStr, left, top, width, height)
{
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  if (screen) {
	y = (screen.availHeight - height)/2;
	x = (screen.availWidth - width)/2;
  }
  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+x+', top='+y+',screenX='+left+',screenY='+top+'');
}