Which file is this HTML code housed in?

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I was using firebug while logged in as an admin. I'm trying to edit the 49px x 49px logo at the left of the edit toolbar. I managed to change the logo with my own easily enough by just overwriting the "logo_menu.png". I can't seem to find which file holds the code:

<li id="ccm-logo-wrapper"><img width="49" height="49" title="concrete5" alt="concrete5" src="/qualityc/concrete/images/logo_menu.png" id="ccm-logo"></li>


I'm just trying to edit the alt text.

Any help is much appreciated, Thanks.