Complex Movie Clip as Button Class Issue

programming flash
1

First, I would like to thank everyone for contributing to this community. I regularly troll the forums for ideas and this will be my first post/request for help. Hopefully my idea is a sound one and will be able to help others once I figure it out.

I want to create a class, or classes, that will allow my designers, working in Flash Pro CS5, to call a Movie Clip from their library to be used as a button on the stage. In a perfect world they would do this with one line of code, setting the dynamic label text, the X and Y position, and setting the URL for the onClick function such as below:

homeBtn.SetBtn("Home", 10, 10, "www.website.com");

Below is the class code I have written:

package 
{
    import flash.display.MovieClip;
    import flash.events.MouseEvent;
    import flash.events.Event;
    import flash.net.URLLoader;
    import flash.net.navigateToURL;

    public class SetBtn extends MovieClip
    {

        public function SetBtn(btnLabel:String,btnX:Number,btnY:Number,btnURL:String)
        {
            //sets the parameters in the constructor function
            btnLabel_txt.text = btnLabel;
            this.x = btnX;
            this.y = btnY;
            this.buttonMode = true;

            //add the event listeners for the mouse events
            this.addEventListener(MouseEvent.CLICK,clickHandler);
            this.addEventListener(MouseEvent.ROLL_OUT,rollOutHandler);
            this.addEventListener(MouseEvent.ROLL_OVER,rollOverHandler);
        }

        //these are the functions for the mouseEvents
        private function rollOverHandler(e:MouseEvent):void
        {
            trace("over is working");
            e.target.gotoAndPlay("Over");
        }
        private function rollOutHandler(e:MouseEvent):void
        {
            trace("out is working");
            e.target.gotoAndPlay("Out");
        }
        private function clickHandler(e:MouseEvent):void
        {
            trace("Click is working");
            try
            {
                navigateToURL(new URLRequest(btnURL),"_blank");
            }
            catch (e:Error)
            {
                trace("Error occurred!");
            }
        }
    }
}

What I need is some direction on how to best implement this idea. How do I direct it to what MC I want in the Library? I am guessing it would be another parameter of the method call, but how would that work? I would like them to be able to use the code on any MC design they create. Any thoughts or ideas would be greatly appreciated.

Thanks

-Gil