Debugging the base URL element with Firebug

Answer 1

http://www.w3schools.com/TAGS/tag_base.asp

the base tag has two components href and target. Yours seems to be fine. coold you give some example of the links on which it is failing?

see http://ashita.org/StackOverflow/base_test.html for a demonstration. (my test)

Edit: see comments

function addBase(url) {
    var regex = /^(https?|ftp):\/\//;

    var a = Array.prototype.slice.call(document.getElementsByTagName('a'),0);
    var link = Array.prototype.slice.call(document.getElementsByTagName('link'),0);
    var script = Array.prototype.slice.call(document.getElementsByTagName('script'),0);
    var img = Array.prototype.slice.call(document.getElementsByTagName('img'),0);

    var hrefs = a.concat(link);
    var srcs = img.concat(script);

    var element,href,src;
    for (var i=0,len=hrefs.length;i<len;++i) {
        element = hrefs[i];
        href = element.getAttribute("href");
        if (href) {
            if (!regex.test(href)) {
                href = (url + "/" + href).replace("//","/"); //to handle double slash     collision
                element.setAttribute("href",href);
            }
        }
    }
    for (var i=0,len=srcs.length;i<len;++i) {
        element = srcs[i];
        src = element.getAttribute("src");
        if (src) {
            if (!regex.test(src)) {
                src = (url + "/" + src).replace("//","/"); //to handle double slash     collision
                element.setAttribute("src",src);
            }
        }
    }
}

Tested and working in firefox