Using a variable in a URL Request

programming flash
1

In AS2 to create a URL that would change depending on the current movie being viewed I would create variable and use this to make up the path, I can’t get this working in AS3, what do I need to do to make this work?

I have


var fileReq3:URLRequest=new URLRequest(currentPath);

var currentPath:String = "mainImages/imageA.jpg";

Then on my buttons I want to just reset the currentPath to image a b c and so on.

When I publish my swf I get an error #2007 parameter must not be null.

Any advice would be much appreciated.

Thanks

Ricky