Random No. Generator

Hello,

I am new to Flash and AS3 and I was trying to create a random number generator. I've included the code at the end. I have a button to generate the number and a dynamic text box called 'output' in which to display the number.

However, when I click "generate", I get the error message --> "1067: Implicit coercion of a value of type uint to an unrelated type String"

I assume this means Flash can't display the number as a string, but is there someway I can do this? Or something I've left out? Can you convert one data type to another? I know you can cast String into numbers, can you do it the other way?

Thanks for any help

CODE:

package

{

    import flash.display.MovieClip

    import flash.events.MouseEvent

    public class Main extends MovieClip

    {

        public function Main()

        {

            generateButton.addEventListener(MouseEvent.CLICK, onGenerateButtonClick);

        }

        function onGenerateButtonClick(event:MouseEvent):void

        {

            var randNum:uint = Math.ceil(Math.random() * 100);

            output_txt.text = randNum;

        }

    }

}