For this you can use the method signature (AjaxHelper, String, String, Object, AjaxOptions, Object) .
public static MvcHtmlString ActionLink( this AjaxHelper ajaxHelper, string linkText, string actionName, Object routeValues, AjaxOptions ajaxOptions, Object htmlAttributes )
As you can see, the last parameter is a set of HTML attributes.
Source: http://msdn.microsoft.com/en-us/library/dd470546.aspx
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