var curid = 0;

function nextpromo(){
	if(arrP.length>1){
		if(curid + 1 >= nbpromo){
			curid = 0;
		}
		else{
			curid++;
		}
		getpromo();
	}
}

function previouspromo(){
	if(arrP.length>1){
		if(curid - 1 < 0){
			curid = nbpromo-1;
		}
		else{
			curid--;
		}
		getpromo();
	}
}

function getpromo(){
	document.getElementById("promo_pic").src = arrP[curid];
	document.getElementById("promo_title").innerHTML = arrT[curid];
	document.getElementById("promo_text").innerHTML = arrD[curid];
	document.getElementById("promo_link").setAttribute("href", arrL[curid]);
}