function changeCadre(myClass){
	var anchors = document.getElementsByTagName('div');
	
	
	for (var i=0; i<anchors.length; i++){
			var anchor = anchors[i];
			
			var relAttribute = String(anchor.getAttribute('title'));
			
			// use the string.match() method to catch 'lightbox' references in the rel attribute
			if (relAttribute.toLowerCase().match('img_cadre1')){
				anchor.className =  myClass;
			}
			if (relAttribute.toLowerCase().match('img_cadre2')){
				anchor.className =  myClass;
			}
		}
}