function popUpImg (URL){
  if (imgP.width==0 || imgP.height==0) setTimeout("popUpImg ('"+URL+"')",100);
  else window.open(URL,"","width="+ (imgP.width+20) +",height="+ (imgP.height+30));
}

function popUp (URL){
  var est =URL.substr(URL.length-3);
  if (est=="jpg" || est=="gif") {
    imgP = new Image();
    imgP.src = URL;
    popUpImg (URL);
  }
  else window.open(URL,"","scrollbars=yes, resizable");
}