//var openimage_path='';

if (openimage_path==undefined) {
  var elements = document.getElementsByTagName('script');
  for (var i=0; i<elements.length; i++) {
    var src = elements[i].src;
    if (src && src.indexOf('openImage.js')>=0) {
      var openimage_path=src.substring(0, src.lastIndexOf('openImage.js'));
      break;
    }
  }
}
function openImage(image_src,alt)  {
  posLeft=(screen.availWidth-310)/2;
  posTop=(screen.availHeight-200)/2;
  BigImage=window.open(openimage_path+'pop_up.htm?'+image_src+'&'+alt,'photo',"status=yes,resizable=yes,width=310,height=200,left="+posLeft+",top="+posTop);
  BigImage.document.focus();
  BigImage.document.close();
}