<?php
define("DEFAULT_CLASS_FILE_SUFIX", ".class.php");

function ice_include($className)
{
    $filename = ICE_DIR . "/" . str_replace("_", "/", $className) . DEFAULT_CLASS_FILE_SUFIX;
    if(!isset($GLOBALS['included_files'][$filename] ))
    { 
        include_once $filename;
        $GLOBALS['included_files'][$filename] = true; 
    }
}