/**
* Requires sniffer.js. Returns true if users browser is one of the supported browsers listed below.
*/
function isSupportedBrowser() {
    var isSupported = false;
    /* Supported Browsers:  Firefox 1.5 and up, Safari, IE 6 and up */
    if (is_chrome || (is_fx && is_minor >= 1.5) || (is_safari) || (is_ie && is_minor >= 6)) {
        isSupported = true;
    }
    return isSupported;
}