function enhancePage(){
	if(!document.getElementById){ return; }
	var head=document.getElementsByTagName('head');
	head=head[0];
	if(head && document.createElement){
		if(typeof(overwriteCSS)!="undefined"){
			css_title='overwrite';
			if(overwriteCSS=='jour'){ css='d'; }
			else if(overwriteCSS=='nuit'){ css='n'; }
			else{ css=overwriteCSS; }
			}else{
			var today=new Date();
			var hours=today.getHours();
			var query=document.location.search;
			if(hours<=7 || hours>=19){ css='n'; css_title='nuit'; }
			else{ css='d'; css_title='jour'; }
			}
		if(css=='n'){
			var logo=document.getElementById('logo');
			if(logo && logo.src){
				if(logo.filters && logo.filters.length>0){
					try{
						tmp=logo.filters.item("DXImageTransform.Microsoft.AlphaImageLoader");
						tmp.src=tmp.src.replace(/_d/,'_n');
						}catch(e){}
					}
				logo.src=logo.src.replace(/_d/,'_n');
				}
			}
		var link=document.createElement('link');
		link.setAttribute('title',css_title);
		link.setAttribute('rel','stylesheet');
		link.setAttribute('type','text/css');
		link.setAttribute('media','all');
		link.setAttribute('href','/login/jn/'+css+'.css');
		head.appendChild(link);
		}
	}
addEvent(window,'load',enhancePage);