window.onload = function () {
document.getElementById('submit').disabled = true;
 var qform = document.getElementById('questionBox');
var inputs = qform.getElementsByTagName('input');
for(var i = 0; i < inputs.length;i++) {
	inputs[i].onclick = function(evt) { checkForm();};
}
}

function checkForm() {
	document.getElementById('submit').disabled = false;
	}