asp.net mvc partialview @Ajax.ActionLink doesn't work

I have a view page

my view page

<div id="beReplaced">
    @Ajax.ActionLink("please click on me to bring the partial view",
                     "PatrialViewToBeCalled",
                     new AjaxOptions()
                        {UpdateTargetId = "beReplaced",
                        InsertionMode = InsertionMode.InsertAfter,
                        HttpMethod="Get",
                        LoadingElementId = "prgress" })
 </div>

i have a Controller

public PartialViewResult PatrialViewToBeCalled()
{
    var customer = db.Customers.First();

    return PartialView("PartialViewThatMustBeShow",customer);
}   

but when i click on the generated link it brings me to a new page instead of replacing or appending the partial view to the div tag.

What's the problem?