Arrrays problem

i have this code, bacausally i have a big array of items and i want to seperate it down into an array or arrays so instead of having an array with 97 items i would have an array with 5 items each is an array with a max of 20 items

index 0 - 20 items (0- 19)
index 1 - 20 items (19 - 40)
index 2 - 20 items (41 - 60)
index 3 - 20 items (61 - 80)
index 4 - 20 items (81 - 97)

this code works if i just put a simlpe value in ie

seperateItemsArray[itemIndex][h]= i  ;

but if i try to put in a array

seperateItemsArray[itemIndex][h]= details[i]  ;

it just goes blank

help

var itemsArray:Array = new Array();
	
	var seperateItemsArray:Array = new Array();
	var itemIndex:Number= 0;
	var h=0;
	
	seperateItemsArray[itemIndex] = new Array();
	
	
	for(var i:Number = 0 ; i < details.length ; i++)
	{
		
		if(h < 20)
		{
			//seperateItemsArray[itemIndex][h] = new Array();
	
			seperateItemsArray[itemIndex][h]= details[i]  ;
			
			
			h++;
		}
		else
		{
			h = 0;
			itemIndex++;
			seperateItemsArray[itemIndex] = new Array();
		}
	}

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