function crawlPage()
{
    var href_links=document.getElementsByTagName("a");
    var base_href = 'http://'+document.domain;
    var base_hrefs = 'https://'+document.domain;

    for (var i=0;i<href_links.length;i++)
    {
       var obj = href_links[i];
       var url = obj.href;

       if ((url.substring(0,7) == 'http://' && url.substring(0,base_href.length) != base_href)  
            || (url.substring(0,8) == 'https://' && url.substring(0,base_hrefs.length) != base_hrefs))
       {
           obj.href = "link.php?url="+url;		
       }
    }
}
window.onload=crawlPage;