Trouble adding a web url link to an existing file: 1046: Type was not found or was not a compile-time constant:

Question

Hi There,
We're trying to add a simple link to an existing Flash file. There looks to be at least 7 separate .as files and a separate swf that loads the main swf which all seems overly complex for what is essentially a page with six buttons on it.
However, we need to add a URL to some of the text. So we converted the text to a button, added an instance name of <ssbpurchasetickets_btn> then added the following Actionscript into the actions layer on the frame the text/button appears:
ssbpurchasetickets_btn.addEventListener(MouseEvent.CLICK, ssbButtonPurchase);
function ssbButtonPurchase(event:MouseEvent):void
navigateToURL(new URLRequest("http://www.url.com/tickets.html"));
When we publish the file we get the following error which seems to cascade into a whole bunch more errors:
Description: 1046: Type was not found or was not a compile-time constant: MouseEvent.
Source: function ssbButtonPurchase(event:MouseEvent):void
We added "ssb" onto the button and functions to ensure there were no conflicts but the same thing occurred. If we copy the button into a new file everything works so it must be conflicting with something in the main files.
Any help would be MUCH appreciated!!!!
Cheers

Answer 1

Thanks for the reply Ned,
The file is set to use AS3 and I'm pretty sure the original should be set to AS3 as the .as files look like AS3 syntax to me - here's a sample:
protected function handleWwrdButtonClick(e:ButtonEvent):void {
Browser.open(globalVar.xml.wwrd.item[0].@url, globalVar.xml.wwrd.item[0].@target);
OmnitureTracker.trackFeaturedContentClick('http://www.url.com/movies/international', 'wwrd_button');
timer.stop();
timer.removeEventListener(TimerEvent.TIMER, onTimer);
I'm wondering if all the Actionscript has be placed into one of the .as files as there isn't any Actionscript in the Flash project - a part from the odd stop()
Really stuck on this one (I'm not an expert at all) so any help in deciphering the project would be much appreciated.
Cheers