//Original:  Cyanide_7 (leo7278@hotmail.com)
//Web Site:  http://www7.ewebcity.com/cyanide7
//This script and many more are available free online at
//The JavaScript Source!! http://javascript.internet.com
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 calculateAmount() {
	if (!document.getElementById('goal').value) { 
		do_not_calculate = true; 
	} else {
		do_not_calculate = false;
	}
	
	if (do_not_calculate) { 
		document.getElementById('amount').innerHTML = ''; 
	} else { 
		document.getElementById('amount').innerHTML = formatCurrency(document.getElementById('goal').value*150);
	}
}

//ADD BLANK INPUTS TO THE INVITE LIST
function addInvitePeople(num){
	
	var array_key = document.getElementById('array_key');
	var blank_people = document.getElementById('blank_people');

	while(num--){
		array_key.value++;

		blank_people.innerHTML+='<div><label for="name['+array_key.value+']">name:</label><input type="text" name="name['+array_key.value+']" id="name['+array_key.value+']" /><br /><label for="email['+array_key.value+']">email:</label><input type="text" name="email['+array_key.value+']" id="email['+array_key.value+']" /></div>';
	}
}