How to make browsers to compress large form posts before sending them to the server

Dear All,
Is There any way to compress large form posts  in client side (in java script )before sending them to the server i have already used  
   var filesSelected = document.getElementById("fileUploadName");
        if (filesSelected.files && filesSelected.files[0]) {
            var fileReader = new FileReader();
            var fileToLoad = filesSelected[0];

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but it give me an error  in base64.js "Uncaught Type Error: Cannot read property 'replace' of undefined"
so any idea what the problem or is there any way to do the require with onther way
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Bob LearnedCommented:
Here is one untried, but possible solution:

ASP.NET WebServices two-way (Response and Request) compression - a general solution

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