function toggleBox(szDivID,iState) // 1 visible, 0 hidden
{
	var understood = document.getElementById('understood').checked;
    var obj = document.getElementById(szDivID);
    if(document.layers)	   //NN4+
    {
		if (understood)
	        obj.style.visibility = 'show';
		else
	        obj.style.visibility = 'hide';
    }
    else if(document.getElementById)	  //gecko(NN6) + IE 5+
    {
		if (understood)
	        obj.style.visibility = 'visible';
		else
	        obj.style.visibility = 'hidden';
    }
    else if(document.all)	// IE 4
    {
		if (understood)
	        obj.style.visibility = 'visible';
		else
	        obj.style.visibility = 'hidden';
    }
}

function init()
{
	var div2 = document.getElementById('div2');
	var div3 = document.getElementById('div3');
    if(document.layers)	   //NN4+
	{
		div2.visibility = 'hide';
		div3.visibility = 'show';
	}
	else
	{
		div2.style.visibility = 'hidden';
		div3.style.visibility = 'visible';
	}
}