Prototype Error

programming flash
1

Can anyone help me with this. It does Not work.


MovieClip.prototype.createArtWork = function(sName, iWidth, iHeight) {
this.createEmptyMovieClip(sName, this.getNextHighestDepth());
sName.beginFill(0xFF0000, 30);
sName.moveTo(10, 10);
sName.lineTo(10+iwidth, 10);
sName.lineTo(10+iwidth, 10+iHeight);
sName.lineTo(10, 10+iHeight);
sName.lineTo(10, 10);
sName.endFill();
    }
    createArtWork("work01", "90", "20");