Jquery uploadify is an invalid solution under FF

Js code

$('#file_upload').uploadify({ 
buttonImage: '${ctx }/commons/uploaddify/img/browse-btn.png', 
swf :'${ctx }/commons/uploaddify/uploadify.swf', 
uploader :'../servlet/defaultDispatcher;jsessionid=${pageContext.session.id}?__action=xxx', 
fileTypeExts: '*.jpg;*.png;*.gif;*.bmp', 
fileTypeDesc: ' The image file ', 
formData: { 
timestamp: new Date().getTime() 
}, 
onSelect: function(file){ 
//Rewrite the check
}, 
onUploadProgress: function(file,bytesUploaded,bytesTotal,totalBytesUploaded,totalBytesTotal){ 
$('#pregress').html(' There's a total upload '+bytesTotal+' Bytes, '+' uploaded '+totalBytesTotal+' byte '); 
}, 
onUploadSuccess: function(file){ 
//Uploaded successfully
} 
}); 

Refer to the web solution and add jsessionId after the uploader path.