JQuery Load using MVC3 #Url.Action does not pass parameters properly - ajax

Question

I noticed that doing #Url.Action("myAction", new { param1 = 123, param2 = 456}) provides me with an invalid URL Home/myAction?param1=123&param2=456.
I am attempting to do
$("#myAjaxDiv").load(url);
But only param1 is getting populated in the action method.
When I remove the & and make it just & then it works, but doing a string replace is super hacky.
url = url.replace("&", "&");
Am I missing something here?
EDIT: Per request I'm including some of my sample app. (you can create a new MVC app and just add these quickly and see for yourself)
Controller:
public ActionResult AjaxTest(int? year, int? month)
{
ViewBag.Message = string.Format("Year: {0}, Month: {1}", year.HasValue ? year.ToString() : "no year", month.HasValue ? month.ToString() : "no month");
return PartialView("AjaxTest");
}
AjaxTest View:
#ViewBag.Message
Index View:
<script>
$(function () {
var url="";
$("#noParams").click(function () {
url = "Home/AjaxTest";
$("#ajaxy").load(url)
$("#url").text(url);
});
$("#yearParam").click(function () {
url = "Home/AjaxTest?year=2012";
$("#ajaxy").load(url)
$("#url").text(url);
});
$("#yearAndMonthParam").click(function () {
url = "Home/AjaxTest?year=2012&month=10";
$("#ajaxy").load(url)
$("#url").text(url);
});
$("#generated").click(function () {
url = "#(Url.Action("AjaxTest", new { year=2012, month=10}))";
$("#ajaxy").load(url);
$("#url").text(url);
});
});
</script>
<a id="noParams" href="#">No Params</a> <br />
<a id="yearParam" href="#">Year Param</a> <br />
<a id="yearAndMonthParam" href="#">Year and Month Param</a> <br />
<a id="generated" href="#">Generated</a> <br />
<div id="ajaxy">
</div>
<div>
URL: <span id="url"></span>
</div>

Answer 1

By default every content (which is not IHtmlString) emitted using a # block is automatically HTML encoded by Razor (see this Razor intro article Html Encoding section)
The Url.Action returns just a plain string so thats why the & gets encoded.
Use the Html.Raw if you don't want the encodeing:
url = "#(Html.Raw(Url.Action("AjaxTest", new { year=2012, month=10})))";

Answer 2

You can build the url in this way also.
var url = "#Url.Action("AjaxTest","YourControllerName")?year=2012&month=10";
$("#ajaxy").load(url);