Anyone tell about scripting scenario

A Simple example
" ENABLING A BUTTON USING SCRIPTING"
first create a button in a applet level and drag and drop the button in UI level
actually it is in disable form
so to enable that button
WebApplet_PreCanInvokeMethod(MethodName,CanInvoke)
{
if(MethodName=="test")
{
CanInvoke = "TRUE";
return(CancelOperation);
}
return(ContinueOperation);
}