Flash CS4 button problem Options

[CandyPop]

I am trying to create a button link in Flash CS4 and I am having a hard time. What is the correct action script?

I have tried using this:

CODE

myButton_btn.onRelease=function(){
getURL("http://www.tutorial5.com/", "_blank");
}

but the Compiler Error box keeps coming up everytime I play the timeline.