those are routes you're passing in
<%= Html.ActionLink("Delete", "Delete",
new { id = item.storyId },
new { onclick = "return confirm('Are you sure you wish to delete this article?');" }) %>
The overloaded method you're looking for is this one:
public static MvcHtmlString ActionLink(
this HtmlHelper htmlHelper,
string linkText,
string actionName,
Object routeValues,
Object htmlAttributes
)