var changeTag = function(count, index, tagPrefix, contentPrefix)
{
	if (!tagPrefix)
		tagPrefix = 'tag_';
	
	if (!contentPrefix)
		contentPrefix = 'content_';
	
	for (var i = 0; i < count; i++)
	{
		var tagNode		= document.getElementById(tagPrefix + i);
		var contentNode	= document.getElementById(contentPrefix + i);
		
		if (tagNode)
			tagNode.className = 'tag tag_' + (i == index ? 'on' : 'off');
		
		if (contentNode)
			contentNode.style.display = i == index ? 'block' : 'none';
	}
};