var calque_image=null;
	var menuTimer=null;
	
	function montreImage(id) {	
		if (calque_image){
			calque_image.style.display='none';				
			calque_image = id2element(id);
		}
		else
			calque_image = id2element(id);
		
		texte=id2element('id_texte_centre');
		if(texte) 
			texte.style.display='none';

		calque_image.style.display='block';

		startMenuTimer();
	}
	
	function cacheImage() {
		if (calque_image) 
			calque_image.style.display='none';
		
		texte=id2element('id_texte_centre');
		if(texte){
			texte.style.display='block';
		}			
		calque_image=null;
	}
	
	function stopMenuTimer() {
		if (menuTimer != null) {
			clearTimeout(menuTimer);
			menuTimer = null;				
		}
	}
	
	function startMenuTimer() {
		stopMenuTimer();
		menuTimer = setTimeout("cacheImage()", 4000);
	}	

	function id2element(id)
	{
		if(document.layers) {
			return document.layers[id];
		}     
		if (document.all){
			return document.all[id];
		}
		else{
			return document.getElementById(id);
		}
	}