var current_link = 1;

function swapImage(number) { 
	newImage = "images/top_link_bg_" + number + ".gif";
	newPath  = "url(" + newImage + ")";
	document.getElementById('top_menu_links').style.backgroundImage = newPath;

	document.getElementById('top_link_1_content').style.display = 'none';
	document.getElementById('top_link_2_content').style.display = 'none';
	document.getElementById('top_link_3_content').style.display = 'none';
	document.getElementById('top_link_4_content').style.display = 'none';

	document.getElementById('top_link_' + number + '_content').style.display = 'block';
<!--	document.getElementById('top_link_' + current_link + '_content').style.display = 'none'; -->
	curent_link = number;
<!--	alert('');  -->
	document.getElementById('top_menu_links').refresh();
}

function swapLinkBg(number) {
	swapImage(number);
}