function openWindow(guid, width, height) 
{
    var iW = parseInt(width) + 50;
    var iH = parseInt(height) + 200;
    var iX = ((screen.availWidth / 2) - (iW / 2));
    var iY = ((screen.availHeight / 2) - (iH / 2));
    var win = window.open('/__tools/zoom_page.aspx?id=' + guid, 'Image', 'width=' + iW + 'px,height=' + iH + 'px,scrollbars=yes,resizable=yes');

    //win.resizeTo(iW, iH)
    win.moveTo(iX, iY);
    
}