function cleanBack() {
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName('a');
	
	// loop through all anchor tags
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];
		
		var relAttribute = String(anchor.getAttribute('rel'));
		
		// use the string.match() method to catch 'lightbox' references in the rel attribute
		if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){
			anchor.onclick = function () {dhtmlHistory.add('location1',{message: 'lightbox'}); countdown(); myLightbox.start(this); return false;}
		}
	}
}