I'm trying to remove the categories navigation once the customer gets to the checkout and beyond. Unless someone has a better suggestion, what I'd like to do is an IF statement along the lines of:

if NOT current page = main_page=checkout_shipping OR NOT current page = main_page=checkout_payment

Then: // show the categories naviation

<div id="navColumnOneWrapper" style="width: <?php echo BOX_WIDTH_LEFT; ?>"><?php require(DIR_WS_MODULES . zen_get_module_directory('column_left.php')); ?></div>

Else // don't show categories navigation

<div id="navColumnOneWrapper" style="width: <?php echo BOX_WIDTH_LEFT; ?></div>

The problem is, I can't figure out how to determine the current page. Is there a php or Zen function that does this? I tried $server([self] (or something like that) but it only returned "index.php" ... not the URL