function switchTab( obj, index, fileName ) {	
		/* switch header background image */
	obj.parentNode.parentNode.style.backgroundImage = "url('/common/images/interface/" + fileName + "')";
		/* switch content */
	var el = document.getElementById('content_tabs_body');
	var children = el.childNodes;
	var divIndex = 1;
	for( var x = 0; x < children.length; x++ ) {
		if ( children[x].nodeType == '1' ) {
			children[x].className = (divIndex == index) ? 'selected' : '';
			divIndex++;
		}
	}
}