function formatNumber(num,prefix){
	num = Math.round(parseFloat(num)*Math.pow(10,2))/Math.pow(10,2)
	prefix = prefix || '';
	num += '';
	var splitStr = num.split('.');
	var splitLeft = splitStr[0];
	var splitRight = splitStr.length > 1 ? '.' + splitStr[1] : '.00';
	splitRight = splitRight + '00';
	splitRight = splitRight.substr(0,3);
	var regx = /(\d+)(\d{3})/;
	while (regx.test(splitLeft)) {
		splitLeft = splitLeft.replace(regx, '$1' + ',' + '$2');
	}
	return prefix +  splitLeft + splitRight;
}

function calculatefee(subscription_fee){
    if (subscription_fee!="0"){
		var divtable = document.getElementById("pricetable");
		var td = divtable.getElementsByTagName("td");
		var tptd = "";
		for (var tdi=1; tdi<=td.length; tdi++){
		  if ((tdi%2!=0) && (tdi>2)) {
			var tptd = td[tdi].innerHTML;
			tptd = tptd.replace("$","");
			tptd = tptd.replace(",","");
			tptd = parseFloat(tptd);
			tptd = tptd - subscription_fee;
			td[tdi].innerHTML =formatNumber(tptd,"$");
		  }
		}
	}
}