import flash.external.*;
var greeting:String;
var btn:MovieClip = createButton(100, 30, 0xCCCCCC);
btn.onPress = function() {
greeting = String(ExternalInterface.call("sayHello", "browser"));
this.mcTxt.text = greeting; // >> Hi Flash.
}
function createButton(width:Number, height:Number, color:Number):MovieClip {
var depth:Number = this.getNextHighestDepth();
var mc:MovieClip = this.createEmptyMovieClip("mc_" + depth, depth);
var mcFmt:TextFormat;
mc.beginFill(color);
mc.lineTo(0, height);
mc.lineTo(width, height);
mc.lineTo(width, 0);
mc.lineTo(0, 0);
mcFmt = new TextFormat();
mcFmt.align = "center";
mcFmt.bold = true;
mc.createTextField("mcTxt", depth, 0, 0, width, height);
mc.mcTxt.text = "Call JS Function";
mc.mcTxt.setTextFormat(mcFmt);
return mc;
}