使用javascript在crm 2011中基于安全角色隐藏站点地图中的链接

Is there any way to hide a link in the SiteMap in CRM 2011 using javascript? The link is not that of an entity. It's basically an injected link which opens up a custom HTML page in the dashboard. Is there any way I can probably wire up a javascript function so that the link can be made visible/hidden by invoking that javascript function?Is there any way to hide a link in the SiteMap