function checkResolution() {
    var viewportwidth;
    var viewportheight;
    // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
    if (typeof window.innerWidth != 'undefined') {
        viewportwidth = window.innerWidth,
          viewportheight = window.innerHeight
    }
    // IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
    else if (typeof document.documentElement != 'undefined'
         && typeof document.documentElement.clientWidth !=
         'undefined' && document.documentElement.clientWidth != 0) {
        viewportwidth = document.documentElement.clientWidth,
           viewportheight = document.documentElement.clientHeight
    }
    // older versions of IE
    else {
        viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
           viewportheight = document.getElementsByTagName('body')[0].clientHeight
    }
    res = screen.width + "x" + screen.height + "y";
    if (viewportwidth <= 1145 || viewportheight <= 790) {
        __doPostBack('', 'true');
    }
    else { }
}