This is my first time here, I hope that this is clear.

So i will have code similar to this this.

 <span class="mediaSource ui-draggable" id="purchsePlay7915504">
    <a href="" onclick="return popup_window(this, 'MediaView', 850, 680)" class="control"  enter code hereid="GenericLink"></a>
    <img id="Any_71" alt="Media Source" src="images/9672web.gif" class="mediaStationIcons mediaWin"/>
    <img class="player" alt="Media Source" src="images/playmedia.gif" style="display: none;"/>
    </span>  

The href portion is generated on the backend, and I have no access to it.

I need to modify some existing jquery code to do something based on what the 'onclick' function is(there are different ones e.g. popup_window1,popup_window2 etc.) .

I tried something like this:

$('.segmentLeft span.mediaSource').click(function(){
if ($('span:contains("popup_window")').length > 0) {
 do something
}
});

but it does not seem to work.