// JavaScript Document
function plusCart(id, maxPiece) {
	if (maxPiece==0) maxPiece=999;
	var obj = document.getElementById(id);
	var val = obj.value.replace(" db", "");
	if ( val < maxPiece ) {  val++; obj.value = val+" db"; }
}

function minusCart(id) {
	var obj = document.getElementById(id);
	var val = obj.value.replace(" db", "");
	if ( val > 1 ) { val--, obj.value = val+" db"; }
}