// Get base url
url = document.location.href;
xend = url.lastIndexOf("/") + 1;
var base_url = url.substring(0, xend);

function ajax_do (url){
    // Does URL begin with http?
    if (url.substring(0, 4) != 'http') {
    	url = base_url + url;
    }

    // Create new JS element
    var jsel = document.createElement('SCRIPT');
    jsel.type = 'text/javascript';
    jsel.src = url;

    // Append JS element (therefore executing the 'AJAX' call)
    document.body.appendChild(jsel);    
}