求解一个兼容问题

Question

<script type="text/javascript" language="javascript">      
        $(function () {
            $(".ab2_5 > ul > div > li > div >img ").each(function (i, n) {
                $(n).attr("onmouseover", "fnSetImgsrc1('" + $(n).attr("dimg") + "')");
            });
         
        });        function fnSetImgsrc1(srcstr) {
            $("#imgmain").attr("src", srcstr);
        }    
    </script>
代码：<div class="ab2_2">
                            <div class="ab2_3">
                                <div class="hidden">                               
                                        <img style="width: 560px; height: 310px;" src='<%=firstimg%>' id="imgmain" />
                                </div>
                            </div>
                            <div class="ab2_4">
                                <div class="ab2_5" id="move"  style="overflow:hidden">
                                    <ul>
                                        <div id="seconde" style="width: 500px; height:2000px">
                                            <asp:Repeater ID="Repsmalimg" runat="server">
                                                <ItemTemplate>
                                                    <li>
                                                        <div class="ab2_6">
                                                              <a  href='<%#Eval("imagepath") %>' rel="lightbox[roadtrip]"> <img style="width: 110px; height: 60px;" src='<%#Eval("imagepath") %>' dimg="<%#Eval("imagepath") %>"/></a>
                                                        </div>
                                                    </li>
                                                </ItemTemplate>
                                            </asp:Repeater>
                                        </div>
                                          <div id="demo2"></div>
                                    </ul>
                                </div>
                                <div class="ab2_7">
                                    <div class="ab2_8" style="cursor: pointer" onclick="left()">
                                        <img src="images/chanpin_06.jpg" /></div>
                                    <div class="ab2_9" style="cursor: pointer" onclick="right()">
                                        <img src="images/chanpin_08.jpg" /></div>
                                </div>
                            </div>
                        </div>在ie7中不能用求大神帮忙，春节快乐

Answer 1

 $(function () { 
$(".ab2_5 > ul > div > li > div  > a > img ").each(function (i, n) {
$(n).mouseover(function(){
fnSetImgsrc1($(this).attr('dimg'));
});;
});          
});
 
function fnSetImgsrc1(srcstr) {
$("#imgmain").attr("src", srcstr);
}  

Answer 2

你把我那些代码拷过去试下，我改了好几个地方，下面是其中一个
$(".ab2_5 > ul > div > li > div >img ")
$(".ab2_5 > ul > div > li > div  > a > img ")

Answer 3

.ab2_5 > ul > div > li > div  > a > img级联这么长，js寻找性能很低的，建议直接在img或a上写一class，直接用class来寻找，会快一点。
分享两个链接：
15个值得开发人员关注的jQuery开发技巧和心得
jQuery性能优化指南 

Answer 4

 dimg不是img的合法属性，不晓得是不是这个问题引起的，建议在img后面跟个hidden来保存图片路径，这样比较靠谱