Buttons inside movie clip dont work

Question

I have a simple HTML website with 5 buttons one of which, a movie clip, drops down 3 more buttons but the buttons dont always work. I get wierd issues for instance: whether I'm on the mcs page or another page completly the drop down buttons only work when Im on the parent movie clips page. When the buttons do work and you click on the button of the page your on  they only work once then the whole issue repeats itself. Hopefully to clarify here is the code inside of the movie clip that directs the drop down buttons.
stop();
var cdButton:URLRequest= new URLRequest("character desin.html");
cd_btn.addEventListener(MouseEvent.CLICK, cd);
function cd(event:MouseEvent):void
        navigateToURL(cdButton,"_self");
var caButton:URLRequest= new URLRequest("concept art.html");
ca_btn.addEventListener(MouseEvent.CLICK, ca);
function ca(event:MouseEvent):void
        trace("ca_btn");
        navigateToURL(caButton,"_self");
var dsButton:URLRequest= new URLRequest("draw sketch.html");
ds_btn.addEventListener(MouseEvent.CLICK, ds);
function ds(event:MouseEvent):void
        trace("ds_btn");
        navigateToURL(dsButton,"_self");

Answer 1

From what I see you are trying to somehow program a Actionscript only iframe navigation. That will never work without an external Interface call to the Browsers Javascript. This is complicated stuff and surely not what you have in mind. If concept art, draw sketch etc. are all separate swf files, you should load them (instead of the html you embedded them in)