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

function changeCurr() {
    var curr = document.getElementById('currency_code').value;
    var curr0 = document.getElementById('curr0');
    var curr1 = document.getElementById('curr1');
    var curr2 = document.getElementById('curr2');
    if(curr == "USD") {
	    curr0.innerHTML = "$";
    	curr1.innerHTML = "$10";
    	curr2.innerHTML = "$20";
    } else {
    	curr0.innerHTML = "€";
        curr1.innerHTML = "€10";
    	curr2.innerHTML = "€20";
    }
}

function changeCountry() {
	var country = document.getElementById('country');
	var custom  =document.getElementById('custom');
	var lc = document.getElementById('lc');
	custom.value = country.value;
	lc.value = country.value;	
}

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');
 	av1.checked = false;
 	av2.checked = false;
 }
 
 function clearUser() {
 	 	var userAmount = document.getElementById('userAmountValue');
 	 	userAmount.value = "";
 }
 
 function validateForm() {

 	var amount = document.getElementById('amount').value;

 	if(amount >= 0) {
 		return true;
 	}
 	return false;
 }
 
 function showExpl(){
 	var disp = document.getElementById('expl').style.display
 	if(disp=='none'){
 		document.getElementById('expl').style.display = 'block';
 	} else {
 		document.getElementById('expl').style.display = 'none';
 	}
}