兼容IE，FF，OP的添加收藏夹（兼容热点）

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var address = function (obj, url, title) {
    var e = window.event || arguments.callee.caller.arguments[0];
 
    var B = {
        IE : /MSIE/.test(window.navigator.userAgent) && !window.opera
        , FF : /Firefox/.test(window.navigator.userAgent)
        , OP : !!window.opera
    };
 
    obj.onmousedown = null;
 
    if (B.IE) {
        obj.attachEvent("onmouseup", function () {
            try {
                window.external.AddFavorite(url, title);
                window.event.returnValue = false;
            } catch (exp) {}
        });
    } else {
        if (B.FF || obj.nodeName.toLowerCase() == "a") {
            obj.setAttribute("rel", "sidebar"), obj.title = title, obj.href = url;
        } else if (B.OP) {
            var a = document.createElement("a");
            a.rel = "sidebar", a.title = title, a.href = url;
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<img src="http://hi.csdn.net/images/csdnlogo.gif" alt="" width="280" height="60" border="0" usemap="#Map" />
<map name="Map">
<area shape="rect" coords="25,14,258,49" onMouseDown="address(this, 'http://www.never-online.net/', 'BlueDestiny前辈的BLOG')" />
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<a href="javascript:void(0);" onMouseDown="address(this, 'http://www.never-online.net/', 'BlueDestiny前辈的BLOG')">添加</a>