[exec]

<script type="text/javascript">
Array.prototype.to2x = function () {
	var temp = [];
	for ( var i = 0; i < this.length; i += 3 ) {
		temp.push(this.slice(i, i + 3));
	}
	return temp;
};

var t = [  0,1,2,3,4,5,6,7,8  ].to2x();
alert(  t[0] + '; ' +  t[1] + '; ' + t[2]  );
</script>