Hello Qsort on ActionScript

Sort.as

package  
{
	/**
	 * ...
	 * @author idkravitz
	 */
	public class Sort 
	{
		public static function qsort(array:Array):Array
		{
			_qsort(array, 0, array.length);
			return array;
		}
		
		private static function _qsort(array:Array, left:uint, right:uint):void
		{
			if (left >= (right-1)) return;
			
			var pivot:uint = (left + right) / 2;
			var swap:Number;
			swap = array[left];
			array[left] = array[pivot];
			array[pivot] = swap;
			pivot = left;
			for (var i:uint = left; i < right; i++)
			{
				if (array[i] < array[pivot])
				{
					swap = array[pivot];
					array[pivot++] = array[i];
					array[i] = array[pivot];
					array[pivot] = swap;
				}
			}
			_qsort(array, left, pivot);
			_qsort(array, pivot+1, right);			
		}
	}

}