Event.observe(window, "load", function() {
    var boxes = $$("textarea.witheditor");
    if (boxes != null && boxes.length > 0) {
        var elementIDs = "";
        for (var i =- 0; i < boxes.length; i++) {
            if (elementIDs.length > 0) {
                elementIDs += ",";
            }
            elementIDs += boxes[i].id;
        }
        tinyMCE.init( { mode: "exact", elements: elementIDs, theme: "advanced", relative_urls: false, remove_script_host: false });
    }
});