var variablen = new Array();
   
      if(window.location.search != "") {
          QUERYSTRING = window.location.search
           QUERYSTRING = QUERYSTRING.replace(/\?/,""); //find start of var declaration
   
        //splits the querystring after each & into substrings if u need more than 1 var
           var teilstrings = QUERYSTRING.split("&");
   
        //traverse each substring
           for (i=0;i<teilstrings.length;i++) {

         //take the var apart from the content
            vararr = teilstrings[i].split("=");
         variablen[vararr[0]] = vararr[1];
                   
           }
                        //save the var "id" in bla but as a number!! 
         var bla = parseInt(variablen["id"]);
         }
      else var bla=0;
//if no var is added to url open first image, thats good if someone nters ur page, because there is probably no var added^^