function toggleUserAmount() {
	if (document.getElementById('userAmount').disabled == true) {
		document.getElementById('userAmount').disabled = false;
	} else {
		document.getElementById('userAmount').disabled = true;
	}
}

function setUserAmount() {
 	var userAmount = document.getElementById('userAmountValue');
 	setAmount(userAmount.value);
 }
 
 function setAmount(value) {
	var amount = document.getElementById('amount');
	amount.value = value;
 }
 
 function unselectOthers() {
 	var av1 = document.getElementById('av1');
 	var av2 = document.getElementById('av2');
 	var av3 = document.getElementById('av3');
 	var av4 = document.getElementById('av4');
 	var av5 = document.getElementById('av5');
 	var av6 = document.getElementById('av6');
 	var av7 = document.getElementById('av7');
 	av1.checked = false;
 	av2.checked = false;
 	av3.checked = false;
 	av4.checked = false;
 	av5.checked = false;
 	av6.checked = false;
 	av7.checked = false;
 }
 
 function clearUser() {
 	 	var userAmount = document.getElementById('userAmountValue');
 	 	userAmount.value = "";
 }