function popup(w,h,site) {
   x = screen.availWidth/2-w/2;
   y = screen.availHeight/2-h/2;
   popupWindow = window.open('pictureResized.php?path='+site,'','width='+w+',height='+h+',left='+x+',top='+y+',screenX='+x+',screenY='+y);
}

<!-- Begin International Sites
function doJump(){
var URL = document.extjump.intsites.options[document.extjump.intsites.selectedIndex].value;
window.location.href = URL;
}
// End International Sites -->