How Can I Download A Image From Browser Using Jquery In Mvc4

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ASP.NET

MVC

<div class="col-sm-12">
        <label>
            Textarea</label>
        <textarea class="form-control" id="demo-code" rows="7" spellcheck="false">
</textarea>
    </div>
    <button id="demo" class="btn btn-primary">
        Run!</button>

inside the textarea the url will be pasted from that how can i download a image in .Zip format

ex:http://www.gravatar.com/avatar/0e39d18b89822d1d9871e0d1bc839d06?s=128&d=identicon&r=PG
from that i want filter the url and save the image in .zip format