// ==== common utilities ====
function gwum_GetElement(anID)
{
	if(document.all)
		return document.all[anID];
	return document.getElementById(anID);
}

// ==== HideBox ====
function gwum_ToggleBox(arrow, boxID)
{
	var box = gwum_GetElement(boxID);
    if(box.style.display == 'block')
    {
    	arrow.src = gwum_arrowUp.src;
    	box.style.display = 'none';
    }
    else
    {
	    arrow.src = gwum_arrowDown.src;
    	box.style.display = 'block';
    }
}