FireFox - Inspect Element

Hi,

For the FireFox's Inspect Element feature, is there an easy way to find where a javascript junction is located?

Let's say I got a function in my HTML body such as "onclick=return CallingMyFunction()" , how do I know where this function was defined? whether in the HTML codes or in a .js file?

I need to know an effective way to locate the codes.

Thank you.