function openimg(url, width, height, winname) {

        var old = self;

        var trails="width=" + width + ",height=" + height + ",toolbar=no,directories=no,status=no,scrollbars=yes,resize=no,menubar=no";

        newWindow1=window.open(url,winname,trails);
        newWindow1.focus();
        }


function changeimg ()
{
var path='bilder/';
var pic=changeimg.arguments[0];

   newPic=path+pic;
   document.bild.src=newPic;
}
function imgpop(){
url = document.bild.src;
url = url.split('.jpg');
url = url[0] + "_g.jpg";
 
openimg(url,540,440);
}