jQuery $.browser as a separate file in case you do not want to include the full migration file

jquery.browser.js

(function( jQuery, window, undefined ) {
"use strict";

var matched, browser;

jQuery.uaMatch = function( ua ) {
	ua = ua.toLowerCase();

	var match = /(chrome)[ \/]([\w.]+)/.exec( ua ) ||
		/(webkit)[ \/]([\w.]+)/.exec( ua ) ||
		/(opera)(?:.*version|)[ \/]([\w.]+)/.exec( ua ) ||
		/(msie) ([\w.]+)/.exec( ua ) ||
		ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec( ua ) ||
		[];

	return {
		browser: match[ 1 ] || "",
		version: match[ 2 ] || "0"
	};
};

// Don't clobber any existing jQuery.browser in case it's different
if ( !jQuery.browser ) {
	matched = jQuery.uaMatch( window.navigator.userAgent );
	browser = {};

	if ( matched.browser ) {
		browser[ matched.browser ] = true;
		browser.version = matched.version;
	}

	// Chrome is Webkit, but Webkit is also Safari.
	if ( browser.chrome ) {
		browser.webkit = true;
	} else if ( browser.webkit ) {
		browser.safari = true;
	}

	jQuery.browser = browser;
}

})( jQuery, window );

Thank you very much :)

I forked this script to add future Opera/Webkit support ;)