IE6下jQuery(js)改变img的src属性图片显示不变的有关问题

IE6下jQuery(js)改变img的src属性图片显示不变的问题
JS代码如下：

JScript code

$("#left_menu li").hover(function(){        $(this).find("a").css("cursor","pointer");        var currentSrc = $(this).find("img").attr("src");        if(currentSrc.indexOf("-on.")==-1){            var afterSrc = currentSrc.replace(".", "-on.");            $(this).find("img").attr("src" ,afterSrc);        }    },function(){        var currentSrc = $(this).find("img").attr("src");        if(currentSrc.indexOf("-on.")!=-1){            if(!$(this).hasClass("active")){                var afterSrc = currentSrc.replace("-on.", ".");                $(this).find("img").attr("src" ,afterSrc);            }        }    });

HTML code

<ul id="left_menu">        <li cls="/platform/index/index/" class="">            <a title="" href="/platform/index/index/" class="store_left_home" style="cursor: pointer;">                <span style="color:#ffffff" class="store_left_number fr">新+</span>                <img class="fl" src="/platform/images/store-shouye.png">                <span class="fl">商店首页</span>            </a>        </li>                                                    <li cls="/platform/list/index/" class="">                <a title="" href="/platform/list/index/" class="store_left_gupiaochi" style="cursor: pointer;">                    <img class="fl" src="/platform/images/store-gupiaochi.png">                    <span class="fl">股票池</span>                </a>            </li>                                             <li cls="/platform/app/index/" class="">                <a title="" href="/platform/app/index/" class="store_left_yingyong" style="cursor: pointer;">                    <img class="fl" src="/platform/images/store-yingyong.png">                    <span class="fl">应用</span>                </a>            </li>                               <li cls="/platform/record/index/" class="active">                 <a title="" href="/platform/record/index/" class="store_left_goumai" style="cursor: pointer;">                     <img class="fl" src="/platform/images/store-goumai-on.png">                     <span class="fl">购买记录</span>                 </a>             </li>    </ul>

CSS code

 浏览器缓存的问题  好像之前碰到这样类似的问题的然后给图片加个参数就可以了如： /platform/images/store-goumai-on.png?t=Math.random();这样避免浏览器缓存不加载问题
[解决办法]
JScript code
    $("#imgid").mouseover(function(){        document.getElementById('imgid').src="img/large.png";        return false;    });        $("#imgid").mouseout(function(){        document.getElementById('imgid').src="img/little.png";        return false;    });