function YOURTHEMENAME_uc_product_add_to_cart( $node ) {

// look up all sku's for this product
$skus=uc_attribute_uc_product_models($node);

  if(!empty($skus)){  // if there are multiple sku's, then list stock availability of options.
  $avail = array();
  foreach($skus as $val) { 
    $sl = uc_stock_level($val);
    if (is_numeric($sl)) {
      $name=lookup_option_name($val);  // get the pretty name of option sku
      $avail[] =  " " .$name." (".$sl.")";     
    }
  }
    if(!empty($avail)) { $avail_string = "<br><div class=\"stock_level\">Number Available: ". implode(",",$avail) ."</div>"; }
    return( $avail_string ). theme_uc_product_add_to_cart($node);
}
else {  // else, we do the normal thing.
  $stocklevel = uc_stock_level($node->model);
  if (is_numeric($stocklevel)) {
    // Stock tracking is active
    if ($stocklevel == 0) {
      return( '<div class="out_of_stock">' . t('Sorry, this item is out of stock') . '</div>' );
    } else {
      return( '<div class="stock_level">' . t('Number available: ') . $stocklevel . '</div>' ) . theme_uc_product_add_to_cart($node);
    }
  } else {
    // Stock tracking is not being used for this product, just show the add to cart button as normal
    return theme_uc_product_add_to_cart($node);
  }
}
}

function uc_attribute_uc_product_models($node) {
  $models = array();
 
  // Get all the SKUs for all the attriibutes.
  $adjustments = db_query("SELECT model FROM {uc_product_adjustments} WHERE nid = %d", $node->nid);
  while ($adjustment = db_fetch_object($adjustments)) {
    if (!in_array($adjustment->model, $models)) {
      $models[$adjustment->model] = $adjustment->model;
    }
  }
 
  return $models;
 
  }
 
 
function  lookup_option_name($sku){
//uc_attribute_options: name,oid
//uc_product_adjustments: combination (number in "quotes" equals oid above),model

$query = "SELECT combination FROM {uc_product_adjustments} WHERE model =  '$sku'";
$result = db_query($query);
  while ($row = db_fetch_array($result)) {
    $combo = $row[combination];
    list($stuff, $oid, $junk) = split('"', $combo);
    $query2="SELECT name FROM {uc_attribute_options} WHERE oid = '$oid'";
    $result2=db_query($query2);
    while($row2=db_fetch_array($result2)){$name=$row2[name];}
    return $name;
  }

}