function getElementsByClassName(class_name)
{
	var all_obj,ret_obj=new Array(),j=0,teststr;

	if(document.all)all_obj=document.all;
	else if(document.getElementsByTagName && !document.all)
		all_obj=document.getElementsByTagName("*");

	for(i=0;i<all_obj.length;i++)
	{
		if(all_obj[i].className.indexOf(class_name)!=-1)
		{
			teststr=","+all_obj[i].className.split(" ").join(",")+",";
			if(teststr.indexOf(","+class_name+",")!=-1)
			{
				ret_obj[j]=all_obj[i];
				j++;
			}
		}
	}
	return ret_obj;
}

function showAnswer(clickedQuestion)
{
  objekte=getElementsByClassName('Question');for (y=0; y<objekte.length; y++) objekte[y].style.display='block';
  objekte=getElementsByClassName('Answer');for (y=0; y<objekte.length; y++) objekte[y].style.display='none';
  
  if (clickedQuestion)
  {
		document.getElementById('Question_'+clickedQuestion).style.display='block';
    document.getElementById('Answer_'+clickedQuestion).style.display='block';
  }
}