I got the answer
Answer above is you have to write the following this code in script.[PHP]alert("hiii");IWEventRegistry.addItemHandler("/jana/myButton", "onCallout", Check);IWEventRegistry.addItemHandler("/jana/myButton1", "onCallout", unCheck);function Check(item) {IWDatacapture.getItem("/jana/checkbox").setValue([0]);}function unCheck(item){IWDatacapture.getItem("/jana/checkbox").setValue([1]);}[/PHP]