var last = 0;

function changeVision( id )
{
    stan = (document.getElementById('answer'+id).style.display == 'none') ? 'block' : 'none';
    if(stan == 'block')
    {
    	//To show
    	document.getElementById('answer'+id).style.display = stan;
    	document.getElementById('question'+id).className = 'question selected';
    	//Hide last
    	if(last > 0)
    	{
	    	document.getElementById('answer'+last).style.display = 'none';
	    	document.getElementById('question'+last).className = 'question';
    	}
    	last = id;
    }
    else
    {
    	//To hide
    	document.getElementById('answer'+id).style.display = stan;
    	document.getElementById('question'+id).className = 'question';
    	last = 0;
    }
}