Problems with jqueryui-checkbox plugin on jquery-ui-1.8rc1

Problems with jqueryui-checkbox plugin on jquery-ui-1.8rc1

I'm trying to use this plugin ( http://www.openpave.org/~reg/jqueryui-checkbox.html )  on jquery-ui-1.8rc1 but it doesn't work.

I am able to recreate the example working on jquery-ui-1.7.2 here  http://jsbin.com/oriju3/8 .

I tried to recreate it on jquery-ui-rc11.8 here http://jsbin.com/oriju3/6  but the plugin isn't working correctly.


When I was trying it on localhost on jquery1.4.1 and jquery-ui-1.8rc1 firebug show me this error.
Checkbox plugin Error

Please somebody help me to make this plugin work on jquery-ui-1.8rc1