uploadify jsp上传附件火狐浏览器不兼容丢失session问题

<script src="public/js/jquery.js" type="text/javascript"></script>
<script type="text/javascript" src="public/js/uploadify/jquery.uploadify.js"></script>


<script type="text/javascript">
$(document).ready(function() {
$("#uploadify1").uploadify({
'auto'           : true,
'swf'            : '../../public/js/uploadify/uploadify.swf',
//'uploader'       : '../public/upload.jsp;jsessionid=<%=session.getId()%>',
'uploader'       : '../public/upload.jsp;jsessionid=' + $("#sessionId").val(),
'queueID'        : 'fileQueue1',
'queueSizeLimit':1,
'preventCaching' :true,
'fileSizeLimit'  :'1024KB',
'fileTypeDesc'   :'jpg,jpeg,png,gif',
'fileTypeExts'   :'*.jpg;*.jpeg;*.png;*.gif',
'multi'          : false,
"uploadLimit"    :5,
"onCancel":function(){
},

'onSelect': function(file) {
},

'onUploadSuccess': function(file,data,response) {
        alert("该附件上传成功");

},