function displaygalerie(id) {
	//alert(id);
	for(var x=0; x<nbGallery; x++){
		
		var monTexte=arrShowIDs[x];

			if (monTexte==id){
				document.getElementById(monTexte).style.display = 'block';
				}
			else
				document.getElementById(monTexte).style.display = 'none';
	}

}

function displayGalleryFirst(){
	var dernierEntreValue=arrShowIDs[dernierEntreID];
	displaygalerie(dernierEntreValue);					
}


function displayGalleryNext(){
	if(thisId!=0){
		thisId--;
		var prevGalleryValue=arrShowIDs[thisId];
	}
	else{
		var prevGalleryValue=arrShowIDs[dernierEntreID];
		thisId=dernierEntreID;
	}
	displaygalerie(prevGalleryValue);
}


function displayGalleryPrev(){
	if(thisId<dernierEntreID){
		thisId++;
		var nextGalleryValue=arrShowIDs[thisId];
	}
	else{
		var nextGalleryValue=arrShowIDs[0];
		thisId=0;
	}
	displaygalerie(nextGalleryValue);
}