var total_pieces = 0;
function calculateTotalPieces(fieldId, piece)
{
	total_pieces = 0;
	var i =0;
	while(1)
	{
		var fieldId = "pieces" + i;
		var pieces=0;
		var fieldIdFlag = document.getElementById(fieldId);
		if( fieldIdFlag != null )
		{
			pieces = document.getElementById(fieldId).value;
			if( pieces != "" ){
				total_pieces = parseInt(total_pieces) + parseInt(pieces);
			}
			i++;
		}else
		{
			break;
		}
	}
	//alert(total_pieces);
	document.getElementById("total_pieces").innerHTML =total_pieces;
	
}