var window_handle = null;
function open_popup1(page1) {
    if (window_handle) window_handle.close();
    window_handle = window.open(page1,'popupWindowName1','status=no,scrollbars=yes,width=550,height=500,screenX=0,screenY=50,left=0,top=50');
    window_handle.focus();
    return;
}