function getInternetExplorerVersion() {
    var rv = -1; // Return value assumes failure.
    if (navigator.appName == 'Microsoft Internet Explorer') {
        var ua = navigator.userAgent;
        var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
        if (re.exec(ua) != null)
            rv = parseFloat(RegExp.$1);
    }
    return rv;

}
function IsIe7() {
    var ver = getInternetExplorerVersion();
    var ie7 = false;
    if (ver > -1) {
        if (ver < 8.0) ie7 = true;
    }
    return ie7;
}