function donneID() {
	for (var i=0; i<vignettes.length; i++) {
		if (vignettes[i]['id']==ID) {
			return i;
		}
	}
}
if (ID!=0) {
	var borneINF=donneID();
	var borneSUP=donneID()+3;
}
else {
	var borneINF=0;
	var borneSUP=3;
}

function afficher(borneINF, borneSUP) {
	var a=1;
	for (var i=borneINF; i<=borneSUP; i++) {
		document.getElementById('elementVignette'+a).innerHTML='<a href="'+vignettes[i]['link']+'"><img src="'+vignettes[i]['photo']+'" border="0" /></a><div align="center" class="titreVignette">'+vignettes[i]['titre']+'</div>';
		a++;
	}
	a=1;
}
afficher(borneINF,borneSUP);
function up() {
	if (borneSUP<vignettes.length) {
		borneSUP+=1;
		borneINF+=1;
		afficher(borneINF,borneSUP);
	}
}
function down() {
	if(borneINF>0) {
		borneSUP-=1;
		borneINF-=1;
		afficher(borneINF,borneSUP);
	}
}