Align Lightbox popup in center of screen?

[BAD311]

I've installed Lightbox 2 on my OSC 2.2 site. It loads up just fine and works awesome. I want to tweak it though.

 

When you click the thumbnail within the product info page (product_info.php) it popups using lightbox.

 

However, it isn't aligned in the center of the browser in either FireFox or IE.

 

How would I go about editing the alignment?

 

The line of code in product_info.php consists of:

 

<script language="javascript"><!--

document.write('<?php echo '<a href="images/' . $product_info['products_image'] . '" rel="lightbox" title="' . $product_info['products_name'] . '">' . tep_image(DIR_WS_IMAGES . $product_info['products_image'], addslashes($product_info['products_name']), SMALL_IMAGE_WIDTH, SMALL_IMAGE_HEIGHT, 'hspace="5" vspace="5"') . '<br>' . TEXT_CLICK_TO_ENLARGE . '</a>'; ?>');

//--></script>

 

Other then that, it's all stock in the JavaScript files and CSS.