Browser Detection

/* getBrowser Extracts the browser name and version number from user agent string.
*		@param elements -
*      	How many elements of the version number should be returned. A
*      	value of 0 means the whole version. If not specified, defaults to
*      	2 (major and minor release number).
*/
function getBrowser(elements) {
	var userAgent = navigator.userAgent;
    var regexps = {
		'Chrome': [ /Chrome\/(\S+)/ ],
		'Firefox': [ /Firefox\/(\S+)/ ],
		'MSIE': [ /MSIE (\S+);/ ],
		'Opera': [ /Opera\/.*?Version\/(\S+)/,  	/* Opera 10 */
				   /Opera\/(\S+)/  ],           	/* Opera 9 and older */
		'Safari': [ /Version\/(\S+).*?Safari\// ]
        },
        re, m, browser, version;
 
    if (elements === undefined)
	{
        elements = 2;
	}
    else if (elements === 0)
	{
        elements = 1337;
	}
 
    for (browser in regexps)
	{
        while (re = regexps[browser].shift())
		{
            if (m = userAgent.match(re)) 
			{
                version = (m[1].match(new RegExp('[^.]+(?:\.[^.]+){0,' + --elements + '}')))[0];
				browserObj = { name : browser, version : version }
				return browserObj;
            }
		}
	}
	return null;
}