Automatically Calling A Lightbox/following A Link

I have been pulling my hair out over this problem for days now, my main aim is to call a lightbox (found at huddletogether)from within ActionScript 3.0, but I couldn't work out how to do this so I have instead passed a variable from the as3 to javascript.

I am then doing a switch..case statement to determine what to do with that variable. The issue I now have is, I need to call the lightbox automatically, when that case is required.

I have tried: document.write('<a href="location" rel="lightbox"> </a>') - along with window.location; where location is the location of the image, and rel=lightbox is a required feature to cause the lightbox to occur. But this, in theory, just creates a link that when the user clicks causes it to happen, but thats not what i need. i need it to automatically do what the link would do if it were pressed.