img_arrow_white_on_blue_up_to_down = new Image();
img_arrow_white_on_blue_up_to_down.src = 'images/arrow_white_on_blue_down.gif';
img_arrow_gray_up_to_down = new Image();
img_arrow_gray_up_to_down.src = 'images/arrow_gray_down.gif';
img_arrow_white_mask_up_to_down = new Image();
img_arrow_white_mask_up_to_down.src = 'images/arrow_white_mask_down.gif';

img_arrow_white_on_blue_down = new Image();
img_arrow_white_on_blue_down.src = 'images/arrow_white_on_blue.gif';
img_arrow_gray_down = new Image();
img_arrow_gray_down.src = 'images/arrow_gray.gif';
img_arrow_white_mask_down = new Image();
img_arrow_white_mask_down.src = 'images/arrow_white_mask.gif';

function toggle(r) {
	if (document.layers) {
	
	} else {
		if (document.all['rnav_'+r].style.display=='block'){
			document.all['rnav_'+r].style.display = 'none';
			theImg = eval('document.rnav_img_' + r);
			if (theImg.src.indexOf('white_on_blue') > -1)
				theImg.src = img_arrow_white_on_blue_down.src;
			else if(theImg.src.indexOf('gray') > -1)
				theImg.src = img_arrow_gray_down.src;
			else
				theImg.src = img_arrow_white_mask_down.src;
		}else{
			document.all['rnav_'+r].style.display = 'block';
			theImg = eval('document.rnav_img_' + r);
			if (theImg.src.indexOf('white_on_blue') > -1)
				theImg.src = img_arrow_white_on_blue_up_to_down.src;
			else if(theImg.src.indexOf('gray') > -1)
				theImg.src = img_arrow_gray_up_to_down.src;
			else
				theImg.src = img_arrow_white_mask_up_to_down.src;
		}
	}
}