<?php

function img_url($img = '') {
    global $_W;
    if (empty($img)) {
        return "";
    }
    if (substr($img, 0, 6) == 'avatar') {
        return $_W['siteroot'] . "resource/image/avatar/" . $img;
    }
    if (substr($img, 0, 8) == './themes') {
        return $_W['siteroot'] . $img;
    }
    if (substr($img, 0, 1) == '.') {
        return $_W['siteroot'] . substr($img, 2);
    }
    if (substr($img, 0, 5) == 'http:') {
        return $img;
    }
    return $_W['attachurl'] . $img;
}
