function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }
    }
    return (arrReturnElements)
}

var w = document.getElementById("ysi_widget"),
    wlinks = getElementsByClassName(document,"*","ysi_widget_link"),
    wclose = document.getElementById("ysi_widget_close"),
    f = document.getElementById("ysi_widget_frame"),
    source = f.src;
for (i = 0; i < wlinks.length; i++) {
    wlinks[i].onclick = function() {
        var lnk = this,
            id = lnk.rel;
        f.src = source + "&id="+id;
        w.style.display = "";
        return false;
    };
}

wclose.onclick = function() {
    w.style.display = "none";
    return false;
}