function behaviviour_backlinks() {
    if (history.length > 0) {
        var container = document.getElementById("backnavigation");
        if (container != null && BEHAVIOUR_BACKLINK_TEXT) {
            var a = document.createElement("a");
            a.setAttribute("href","javascript:history.back()")
            a.appendChild(document.createTextNode(BEHAVIOUR_BACKLINK_TEXT))
            container.appendChild(a);
        }
    }
}
addOnloadEvent("behaviviour_backlinks()");