$(document).ready(function() {

  var gbOptionen = 
   {
    gbWidth: 965,
    gbHeight: hoehe (),
    captionHeight: 22,
    ffMacFlash: true
   };

$('a[href*=index.php?shop=]').greybox(gbOptionen);

}); // ready

function hoehe () 
{
  if (window.innerHeight) 
     {
      return window.innerHeight-((window.innerHeight*10)/100); 
     } 
  if (document.body && document.body.offsetHeight) 
     {
      return document.body.offsetHeight-((document.body.offsetHeight*10)/100);
     } 
}