function promo_init(){
}

function promo_rotate(){
	var url,img,pnb,place,alt,title;
	for(place in pindex){
		pindex[place]=promo_next_index(pindex[place],1,promos[place].length);
		pnb=0;
		while(eval("document.getElementById('p_"+place+"_url_"+pnb+"')")){
			pnb++;
		}
		if(pnb<promos[place].length){
			idx=0;
			while(idx<pnb){
				url=promos[place][promo_next_index(pindex[place],idx,promos[place].length)][0];
				img=promos[place][promo_next_index(pindex[place],idx,promos[place].length)][1];
				alt=promos[place][promo_next_index(pindex[place],idx,promos[place].length)][2];
				title=promos[place][promo_next_index(pindex[place],idx,promos[place].length)][3];
				document.getElementById('p_'+place+'_url_'+idx).href=url;
				document.getElementById('p_'+place+'_img_'+idx).src=img;
				document.getElementById('p_'+place+'_img_'+idx).alt=alt;
				document.getElementById('p_'+place+'_url_'+idx).title=title;
				idx++;
			}
		}
	}
}

function promo_next_index(actual,increment,max_size){
	actual+=increment;
	if(actual>=max_size){
		actual-=max_size;
	}
	return actual;
}