var agt = navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);

// Check Platform
var is_win = (agt.indexOf("win") != -1);
var is_mac = (agt.indexOf("mac") != -1);

// Check Browser
var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ns = (agt.indexOf("netscape") != -1);

// Check MSIE Version
var is_ie5_2 = (is_ie && (agt.indexOf("msie 5.2") != -1));
var	is_ie5_5 = (is_ie && (agt.indexOf("msie 5.5") != -1));
var is_ie6 = (is_ie && (agt.indexOf("msie 6.0") != -1));
var is_ie7 = (is_ie && (agt.indexOf("msie 7.0") != -1));
var is_ie8 = (is_ie && (agt.indexOf("msie 8.0") != -1));
var is_compatibleIE = ((is_win && (is_ie5_5 || is_ie6 || is_ie7 || is_ie8)) || (is_mac && is_ie5_2));

// Check Netscape Version
var is_ns6_2 = (agt.indexOf("netscape6/6.2") != -1);
var is_ns7 = (agt.indexOf("netscape/7") != -1);
var is_ns5bsd = (agt.indexOf("freebsd 5") != -1);
var is_compatibleNS = (is_ns6_2 || is_ns7 || is_ns5bsd);

// Check Safari Version
var is_safari = (agt.indexOf("safari") != -1);

// Check Mozilla Version
var is_firefox = (agt.indexOf("firefox") != -1);

// Check Other Platforms
var is_supportedOS = (is_win || is_mac)

// Check Other Browsers
var	is_supportedBwsr = (is_ie || is_ns || is_safari || is_firefox)