function popup (keyword)
{
var windowprops = "height=550,width=750,top="+ (screen.height - 550)/2+ ",left=" + (screen.width - 750)/2 +",location=no," + "scrollbars=yes,menubars=no,toolbars=no,resizable=yes";
keyword = "./Item preview.php?image=" + keyword;
popuphelp = window.open(keyword,"MenuPopup",windowprops);
popuphelp.focus();
}