Calling a function within itself *resolved*

[Graff]

I'm having a problem with a peice of code, it will execute fine except it won't go into the call.

function GetSubCategory($id,$str,$folder)
	{
		$db = OpenDB();
		
		$r = mysql_query("SELECT category_id,name,folder FROM category WHERE category_id <> ".$id." AND category_parent_id = ".$id,$db);
		
		while($row = mysql_fetch_array($r))
		{
			$r2 = mysql_query("SELECT count(*) as pages FROM Page p, category c WHERE p.category_id = c.category_id AND c.category_id = ".$row['category_id'],$db);
			$row2 = mysql_fetch_array($r2);
			$pages = $row2['pages']-1;		//ignore the index.php
			$folder += $row['folder']; 		//append new folder to existing
			echo $str."<a href='".$folder."'>".$row['name']." (".$pages.")</a><br>\n";
			$str += "<a href='".$folder."'>".$row['name']."</a>&gt;&gt;";
			GetSubCategory($row['id'],$str,$folder);
		}
		CloseDB($db);
	
	}

I don't get any warnings or error messages, it just stops.