function ShowContact(num) {
        var myWin;
        myWin = window.open("contact_form.jsp?id=" + num, "crescendo", "width=" + 600 + ",height=" + 400 + ", scrollbars=1,top=0,left=0");
        myWin.moveTo((screen.width-600)/2, (screen.height-400)/2);
      }