function formatCurrency(num) {
num = num.toString().replace(/\$|\,/g,'');
if(isNaN(num))
num = "0";
sign = (num == (num = Math.abs(num)));
num = Math.floor(num*100+0.50000000001);
cents = num%100;
num = Math.floor(num/100).toString();
if(cents<10)
cents = "0" + cents;
for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
num = num.substring(0,num.length-(4*i+3))+','+
num.substring(num.length-(4*i+3));
return (((sign)?'':'-') + '$' + num + '.' + cents);
}

function calculatefood() {

	var weight=document.getElementById("weight").value;
	var description=document.statsform.description.options[document.statsform.description.selectedIndex].value;
		
	var dailyfeeding=Math.round(weight*description*100)/100;
	var twotimesdaily=Math.round((dailyfeeding/2)*100)/100;
	var weeklyfeeding=Math.round(dailyfeeding*7*100)/100;
	var biweeklyfood=Math.ceil(weeklyfeeding*2);
	var poultryorder=biweeklyfood*3.25;
	var redmeatorder=biweeklyfood*3.90;

		
document.getElementById('daily').innerHTML=dailyfeeding;
document.getElementById('twicedaily').innerHTML=twotimesdaily;
document.getElementById('weekly').innerHTML=weeklyfeeding;
document.getElementById('biweekly').innerHTML=biweeklyfood;
document.getElementById('poultrycost').innerHTML=formatCurrency(poultryorder);
document.getElementById('redmeatcost').innerHTML=formatCurrency(redmeatorder);

}