Updated to support jQuery >1.9.0

Doesn't worked with jQuery >1.9.0 because $.browser was removed from jQuery lib:
http://jquery.com/upgrade-guide/1.9/#jquery-browser-removed

I have replaced the following:
-  f.browser.msie 
+  navigator.appName == 'Microsoft Internet Explorer'

-  parseInt(f.browser.version.charAt(0)) === 6)
+ navigator.userAgent.match(/msie 6/i))

Otherwise the Plugin does not work and outputs: f.browser is undefined