navigateToURL not working in IE7

I have a series of buttons that I want to act as links. In firefox and safari, the links work fine, but in IE, it reacts as if I hit the reload button…This is the code I am using:

private function launchCourse(event:MouseEvent):void
	navigateToURL(new URLRequest(String(courseInfo[].courseURL)),"_self");

any ideas??

I am using right now and using javascript to change pages right now which is working, but I do not want to rely on javascript…