Jquery Ui Combobox and onchange on all and setval

I have a web project with many selects that are already programmed like a chained selects. I want to turn them all to comboboxes and have 2 main issues. how to make that onchange of select will be also transfered automatically to onchange of combobox and when i have set valu开发者_如何学JAVAe operation to given select which is transfered to be a combobox , all this operations will wark also without extrea recoding...

you can see this this may help you adding change event http://jsfiddle.net/mhameen/jBqkp/