Event.observe(window, 'load', init, false);

var earned_points = 0;
var currentQuestionId;
var addpointsArray = new Array();

function init() { 
}


function goBack() {
	$('question' + currentQuestionId).style.display='none';
	currentQuestionId--;
	$('question' + currentQuestionId).style.display='block';
	
	earned_points -= addpointsArray.pop();
	percentage = earned_points / $('max_points').value;
    $('progress').style.width = Math.floor(percentage * 594) + 'px'; 
}


function increment_points(value) {	
  addpointsArray.push(value);

  earned_points += value;
  percentage = earned_points / $('max_points').value;
  $('progress').style.width = Math.floor(percentage * 594) + 'px';   
}


function next_question(question_id) {
//  if (question_id == 0) {
//    $('description').style.display='none';
//  }
  $('question'+question_id).style.display='none';
  
  question_id++;  
  
  if ($('question'+question_id)) {
    currentQuestionId = question_id;
    $('question'+question_id).style.display='block';	
  } else {
    $('earned_points').value = earned_points;
    $('questions').submit();
  }
  
}