JavaScript - Backtracking code?

Question

I'm just opened FireBug and saw this on my site

<div style="display: none; width: 0px; height: 0px; overflow: hidden;">
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
    <iframe src="javascript:void(0)" style="display: none;"></iframe>
</div>

Is there a way to backtrack this code and see where it originated from as it's not hardcoded?

Answer 1

The answer to WHAT made this is - Google Maps. No way around that. So that is solved. It does however not answer the actual question - Is there a way to backtrack dynamic code to it's origin?