if ($(".tips").length>0)
{
    $(".tips").css("cursor","pointer");
    $(".tips").hover(function()
    {
        var div;
        if (!document.getElementById("yytips"))
        {
            div = document.createElement("div");
            div.id = "yytips";
        }
        else
        {
            div = document.getElementById("yytips");
        }
        $(div).html(this.content);
        var offset = $(this).offset();
        $(div).css({position:"absolute",width:"300px",left:offset.left+"px",top:offset.top+25+"px"});
        $(div).appendTo($("body"));
        $(div).show();
    },
    function()
    {
        $("#yytips").hide();
    }
    );
}
//用法：<span class='tips' content='tip内容(支持HTML，注意引号'的处理)'>提示</span>