var previousSection = 0;
			
function openCloseSection(id) {
	if (previousSection != id) {
		// handle the opening and closing of different navigation elements
		if (previousSection != 0) {
			document.getElementById('nav_'+previousSection).style.display = 'none';
			document.getElementById('image_'+previousSection).src = 'images/template_top/aff_arrow_right.gif';
		}	
		document.getElementById('nav_'+id).style.display = 'block';	
		document.getElementById('image_'+id).src = 'images/template_top/aff_arrow_down.gif';
	}
	else {
		// handle the opening/closing of the same menu element
		docElement = document.getElementById('nav_'+id);
		docElement.style.display = ((docElement.style.display == 'none') ? 'block' : 'none');
		imageElement = document.getElementById('image_'+id);
		imageElement.src = ((imageElement.src == 'images/template_top/aff_arrow_right.gif') ? '/images/template_top/aff_arrow_down.gif' : '/images/template_top/aff_arrow_right.gif');
	}
	previousSection = id;
}

function add_block_highlight(b_id) {
	blockElement = document.getElementById('block_'+b_id);
	blockElement.style.background = '#F8F8F8';
}

function remove_block_highlight(b_id) {
	blockElement = document.getElementById('block_'+b_id);
	blockElement.style.background = '#FFFFFF';
}