function _update_ProfitCalc(){

	var sellers = document.getElementById('profitcalc_sellers').value || 0;
	var sales = document.getElementById('profitcalc_sales').value || 0;
	var total = sellers * sales;
	var multiplier = 0;
	
	if(total <= 4){

		multiplier = 4;

	}
	else if(total <= 49){

		multiplier = 8;

	}
	else if(total <= 999){

		multiplier = 10;

	}
	else if(total <= 1999){

		multiplier = 11;

	}
	else if(total <= 1999){

		multiplier = 11;

	}
	else if(total >= 2000){

		multiplier = 12;

	}
	else{

		multiplier = 6;

	}

	var profit = _pc_AddCommas(total * multiplier);

	document.getElementById('profitcalc_result').innerHTML = '$'+profit+' Profit';

}
function _pc_AddCommas(nStr){

	nStr += '';

	var x = nStr.split('.');
	var x1 = x[0];
	var x2 = x.length > 1 ? '.' + x[1] : '';
	var rgx = /(\d+)(\d{3})/;

	while (rgx.test(x1)) {

		x1 = x1.replace(rgx, '$1' + ',' + '$2');

	}

	return x1 + x2;

}