// JavaScript Document
function addProd(id)
{
	var elm = document.getElementById(id);
	if (elm)
	{
		var val = 0;
		if (elm.value != "")
			val = parseInt(elm.value);
		val += 1;
		elm.value = val;
	}
}

function subProd(id)
{
	var elm = document.getElementById(id);
	if (elm)
	{
		var val = 0;
		if (elm.value != "")
			val = parseInt(elm.value);
		val -= 1;
		if (val < 0) val = 0;
		elm.value = val;
	}
}