MVC3 Url.Action querystring generation

I am trying to generate an url for an MVC 3 action within javascript environment (in a cshtml file).

<script type="text/javascript">
  ...
  var src = "@Url.Action("GetProductImage", new { productId = Model.Product.Id, pos = 1, size = 0 })";
  $(document.createElement("img")).attr("src", src);
  ...
</script>

Now this works almost fine, my problem is that the querystring is being escaped. Instead of:

"/Products/GetProductImage?productId=1&pos=0&size=0"

it generates:

"/Products/GetProductImage?productId=1&pos=0&size=0"

so my action does not get called.

Now I know I can make my own custom Url helper function, but I was wondering if I can use this or some other built in helper to get the unescaped URL?

Thanks in advance, G.