// JavaScript Document

var indent=5;						//set here the left indent in pixels 
var iup='http://www.stanford.edu/dept/registrar/images/plus.gif';	//set here the up arrow relative location 
var idrop='../../images/minus.gif';	//set here the drop arrow relative location 

function coll()
{
	/* add try/catch block to eliminate error notification on pages without 'quiz' */
	try
	{
		var dd=document.getElementById('quiz').getElementsByTagName('div');
		var aa=document.getElementById('quiz').getElementsByTagName('img');
		for (var i=1;i<dd.length;i=i+2)
		{
			dd[i].style.position='relative';
			dd[i].style.display='none';
			dd[i].style.left=indent+'px';
		}
		for (var j=0;j<aa.length;j++)
		{
			im=aa[j].getAttribute('src');
			if(im==idrop)
			{
				aa[j].setAttribute('src',iup);break
			}
		}
	}
	catch ( x )
	{
		// ignore error 'x' on page without a quiz section 	
	}	
}

function activ(w)
{
	var d=w.parentNode.getElementsByTagName('div')[0];
	var a=w.firstChild;
	if(d.style.display=='none')
	{
		coll();
		d.style.display='block'; /* changed from 'inline' */
		a.setAttribute('src',idrop);
	}
	else
	{
		d.style.display='none';
		a.setAttribute('src',iup);
	}
	return false;
}

if ( window.attachEvent ) {	
	window.attachEvent("onload",coll);
	}
else if ( window.addEventListener ) {
	window.addEventListener("load",coll,true);
	}