Does anyone know how to modify this?

[freshman]

I have a big ask!
I need to turn this menu into a drop down menu system.
Does anyone have a clue how?

[e-mail]

// -------------------------------------------------------------
// Show the Main Menu
// -------------------------------------------------------------
function showMainMenu($menu_format) {
global $pg, $add_parent_id, $t_parent_id, $url_path;

if(!$t_parent_id) {
	$c_sql = "SELECT item_id, item_name, item_image, sort_nbr, url_out, parent_id from dot_pages".
		" WHERE parent_id = 1 AND status = \"Publish\" ORDER BY sort_nbr";
} else {
	$c_sql = "SELECT item_id, item_name, item_image, sort_nbr, url_out, parent_id from dot_pages".
	" WHERE parent_id = 1 AND status = \"Publish\" ORDER BY sort_nbr";
}

$c_items = mysql_query($c_sql);

$num_items = mysql_num_rows($c_items) + 1;

if($num_items == 0) {
	$cell_pct = "100%";
	} else {
	$cell_pct = (100 / $num_items);
	}


if (!$c_items) {
	echo("<P>There is a problem with getting the children records.<BR>Error: " . mysql_error());
exit();
}

$main_menu = "<div class=\"MAINMENU\">";
$main_menu_wide = "<table class=\"MENUTABLE\"><tr valign=\"top\">";


while ($c_item = mysql_fetch_array($c_items)) {
	$c_item_id   = $c_item["item_id"];
	$c_item_name = $c_item["item_name"];
	$item_image = $c_item["item_image"];
	$c_url_out = $c_item["url_out"];
	$c_sort_nbr = $c_item["sort_nbr"];
	$c_parent_id = $c_item["parent_id"];

	if($c_url_out == "") {
		if(!$item_image) {
			$main_menu .= "<a class=\"MAINMENUITEM\" href=\"".$url_path."index.php/".$c_item_id."\">".$c_item_name."</a><br><br>\n";
			$main_menu_wide .= "<td nowrap width=\"\"><a class=\"MAINMENUITEM\" href=\"".$url_path."index.php/".$c_item_id."\">".$c_item_name."</a>&nbsp;</td>\n";
		} else {
			include("includes/convert_imageinfo.inc");
			$main_menu .= "<a class=\"MAINMENUITEM\" href=\"".$url_path."index.php/".$c_item_id."\">".$item_image."</a><br><br>\n";
			$main_menu_wide .= "<td nowrap width=\"".$cell_pct."%\"><a class=\"MAINMENUITEM\" href=\"".$url_path."index.php/".$c_item_id."\">".$item_image."</a></td>\n";
		}
	} else {
		if(!$item_image) {
			$main_menu .= "<a class=\"MAINMENUITEM\" href=\"".$url_path."redirect.php?go=$c_url_out\">$c_item_name</a><br><br>";
			$main_menu_wide .= "<td nowrap width=\"".$cell_pct."%\"><a class=\"MAINMENUITEM\" href=\"".$url_path."redirect.php?go=$c_url_out\">$c_item_name</a></td>";
		} else {
			include("includes/convert_imageinfo.inc");
			$main_menu .= "<a class=\"MAINMENUITEM\" href=\"".$url_path."redirect.php?go=$c_url_out\">$item_image</a><br><br>";
			$main_menu_wide .= "<td width=\"".$cell_pct."%\"><a class=\"MAINMENUITEM\" href=\"".$url_path."redirect.php?go=$c_url_out\">$item_image</a></td>";
		}
	}
}

$main_menu .= "</div>";
$main_menu_wide .= "</tr></table>";

if($menu_format == "stacked") {
	return $main_menu;
} else {
	return $main_menu_wide;
}

}