var thisNavItem = null;

function init_nav_items() {
	var navitems = get("navigation").getElementsByTagName('a');
	for(var n=0; n<navitems.length; n++) {
		if(navitems[n].firstChild.src.indexOf('2.gif') > 0) {
			thisNavItem = navitems[n].firstChild;
			break;
		}
	}

	if($('floatdiv'))
		$('floatdiv').removeClassName('print-block').addClassName('screen-block');
}

function swap_image(img, newsrc) {
	if(thisNavItem) thisNavItem.src = thisNavItem.src.replace('2.gif', '1.gif');
	img.oldsrc = img.src;
	img.src = newsrc;
}

function swap_image_restore(img) {
	img.src = img.oldsrc;
	if(thisNavItem) thisNavItem.src = thisNavItem.src.replace('1.gif', '2.gif');
}