Issue:
Each time div.a is clicked, the number of callbacks when div.b is clicked,accumulates by 1. 

```
var $=jQuery;
$(function(){
   $("div.a").click(function(){cbf(trgmsg);});
});
function trgmsg(){
   alert($.now());
}
function cbf(cb){
   $("div.b").click(function(){cb()});
}

```

Result:  

click div.a once and click div.b => alert() pops-up;  

if i click div.a again and click div.b => alert() pops-up twice consecutively;  

if i click div.a another time and click div.b => alert() pops-up three times consecutively;  

..and so on  

I have No idea what the cause of the problem is or if its simply my misunderstanding/misuse of callback functions in JS. Any insights and/or advice will be greatly appreciated. thanks