window.onload = function(){
	document.getElementById('donateForm').onclick = function(){
		checkDonate();
	}

	document.getElementById('bedrag-anders').onkeyup = function(event){
		checkDonate();
		isNumberKey(event);
	}
}

function isNumberKey(evt) {
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode < 48 || charCode > 57))
	
	
	return true;
}


function checkDonate(){

	var sendbutton = document.getElementById('send-btn');
	var emailValue = document.getElementById('email').value;
	var emailPattern	= /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
	if(document.getElementById('bedrag_r').checked == true){
		document.getElementById('bedrag-anders').disabled = false;
	} else {
		document.getElementById('bedrag-anders').disabled = true;
	}
	if(
		document.getElementById('bedrag5').checked == true ||
		document.getElementById('bedrag10').checked == true ||
		document.getElementById('bedrag15').checked == true ||
		document.getElementById('bedrag25').checked == true ||
		document.getElementById('bedrag-anders').value > 1
	){
		if( emailPattern.test(emailValue) || emailValue == '' ){
			//sendbutton.className = 'send-btn';
			sendbutton.disabled = false;
		} else {
			//sendbutton.className = 'send-btn-inactive';
			sendbutton.disabled = true;
		}
	} else {
		//sendbutton.className = 'send-btn-inactive';
		sendbutton.disabled = true;
	}	
}