// Found on: http://www.sitepoint.com/blogs/2004/05/26/closures-and-executing-javascript-on-page-load/
function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}

addLoadEvent(externalLinks);