var error = false;
if(window['bigwww_rid']&&bigwww_rid-0>0) bigwww_rid-=0;
else error = 'bigwww_rid';
if(window['bigwww_ad_id']&&bigwww_ad_id-0>0) bigwww_ad_id-=0;
else error = 'bigwww_ad_id';
if(error){
    //未设置广告id,不能正常显示广告.
    //此处可进一步作其它处理(例如向数据库写入信息...)
    document.write('<h2>',error,' ERROR</h2>');
}else{
    window.min_w = 120; //广告最小高宽
    window.min_h = 50;
    window.bigwww_script = document.getElementById('bigwww_script'+bigwww_ad_id);
    window.bigwww_ad_width = null;
    window.bigwww_ad_height = null;
    if(!bigwww_script){
        //没有为<script>设置正确的id不要紧,只要本脚本被解析就说明已经在页面插入了广告代码
        //试图去寻找对应的<script>标签的目的只是为了得到用户设置的广告尺寸
        bigwww_ad_width = window.min_w;
        bigwww_ad_height = window.min_h;
    }else{
        var bigwww_src = bigwww_script.getAttribute('src'),
            bigwww_querystr = bigwww_src.split('?',2)[1],
            bigwww_query = {},temp;
        bigwww_querystr = bigwww_querystr.split('&');
        for(var i=0,len=bigwww_querystr.length;i<len;++i){
            temp = bigwww_querystr[i].split('=');
            bigwww_query[temp[0]] = temp[1];
        }
        bigwww_ad_width = bigwww_query['width']-0;
        bigwww_ad_height = bigwww_query['height']-0;
        if(bigwww_ad_width<window.min_w||isNaN(bigwww_ad_width)) bigwww_ad_width = window.min_w;
        if(bigwww_ad_height<window.min_h||isNaN(bigwww_ad_height)) bigwww_ad_height = window.min_h;
    }
    document.write('<iframe height="',bigwww_ad_height,'" frameborder="0" width="',bigwww_ad_width,'" scrolling="no" allowtransparency="true" hspace="0" vspace="0" marginheight="0" marginwidth="0" src="http://sudu.cn/system/recommender/get_ad_content.php?ad_id=',bigwww_ad_id,'&rid=',bigwww_rid,'&url=',encodeURIComponent(parent.location),'"></iframe>');
}