function update_qty(id,price2,commands){
	
	qty 	= $('div_agent_qty'+id).innerHTML;
	qty2 	= $('div_total_qty').innerHTML;
	price 	= $('div_price').innerHTML;
	
	qty 	= parseInt(qty);
	qty2 	= parseInt(qty2);
	price 	= parseFloat(price);
	price2 	= parseFloat(price2);
	
	if (commands == 'add') {
		qty = qty + 1;
		qty2 = qty2 + 1;
		price = price + price2;
	} else {
		if (qty != 0) {
			qty = qty - 1;
			qty2 = qty2 - 1;
			price = price - price2;
		}
	}
	
	if (qty2 == 0) {
		Element.hide('checkout_button');
	} else {
		Element.show('checkout_button');
	}
	
	updatediscount(qty2, price);
	
	$('div_agent_qty'+id).innerHTML = qty;
	$('div_price').innerHTML = roundNumber(price, 2);
	$('div_total_qty').innerHTML = qty2;
	document.getElementById('form_agent_qty'+id).value = qty;
	
	
}



function roundNumber(number,decimals) {
	var newString;// The new rounded number
	decimals = Number(decimals);
	if (decimals < 1) {
		newString = (Math.round(number)).toString();
	} else {
		var numString = number.toString();
		if (numString.lastIndexOf(".") == -1) {// If there is no decimal point
			numString += ".";// give it one at the end
		}
		var cutoff = numString.lastIndexOf(".") + decimals;// The point at which to truncate the number
		var d1 = Number(numString.substring(cutoff,cutoff+1));// The value of the last decimal place that we'll end up with
		var d2 = Number(numString.substring(cutoff+1,cutoff+2));// The next decimal, after the last one we want
		if (d2 >= 5) {// Do we need to round up at all? If not, the string will just be truncated
			if (d1 == 9 && cutoff > 0) {// If the last digit is 9, find a new cutoff point
				while (cutoff > 0 && (d1 == 9 || isNaN(d1))) {
					if (d1 != ".") {
						cutoff -= 1;
						d1 = Number(numString.substring(cutoff,cutoff+1));
					} else {
						cutoff -= 1;
					}
				}
			}
			d1 += 1;
		} 
		newString = numString.substring(0,cutoff) + d1.toString();
	}
	if (newString.lastIndexOf(".") == -1) {// Do this again, to the new string
		newString += ".";
	}
	var decs = (newString.substring(newString.lastIndexOf(".")+1)).length;
	for(var i=0;i < decimals-decs;i++) newString += "0";
	return newString; // Output the result to the form field (change for your purposes)
}


function updatediscount(qty, price) {
var qty = parseInt(qty);
	if (1 <= qty && 3 >= qty) { 
		var final = price - (price * 0)/ 100;
		$('div_discount').innerHTML = '0%';
		$('div_final').innerHTML = roundNumber(final,2);
	} 
	if (4 <= qty && 6 >= qty) { 
		var final = price - (price * 5)/ 100;
		$('div_discount').innerHTML = '-' + roundNumber((price * 5)/ 100, 2) + ' @ 5%';
		$('div_final').innerHTML = roundNumber(final,2);
	} 
	if (7 <= qty && 8 >= qty) { 
		var final = price - (price * 10)/ 100;
		$('div_discount').innerHTML = '-' + roundNumber((price * 10)/ 100, 2) + ' @ 10%';
		$('div_final').innerHTML = roundNumber(final,2);
	} 
	if (8 <= qty && 10 >= qty) { 
		var final = price - (price * 15)/ 100;
		$('div_discount').innerHTML = '-' + roundNumber((price * 15)/ 100, 2) + ' @ 15%';
		$('div_final').innerHTML = roundNumber(final,2);
	} 
	if (10 <= qty && 15 >= qty) { 
		var final = price - (price * 20)/ 100;
		$('div_discount').innerHTML = '-' + roundNumber((price * 20)/ 100, 2) + ' @ 20%';
		$('div_final').innerHTML = roundNumber(final,2);
	} 
	if (16 <= qty && 1000000000 >= qty) { 
		var final = price - (price * 25)/ 100;
		$('div_discount').innerHTML = '-' + roundNumber((price * 25)/ 100, 2) + ' @ 25%';
		$('div_final').innerHTML = roundNumber(final,2);
	} 
}