var strUA = "";
var userAgent = window.navigator.userAgent.toLowerCase();
var appVersion = window.navigator.appVersion.toLowerCase();
if (userAgent.indexOf("msie") > -1) {
if (appVersion.indexOf("msie 6.0") > -1) {
    document.write(exIE);
}
else
if (appVersion.indexOf("msie 7.0") > -1) {
    document.write(exIE);
}
}