function create_html(content){
	if(content[3] != '')
		return '<b>'+content[0]+'</b><br /><a href="'+content[2]+'" target="_top"><img src="'+content[1]+'" border="0"><br />More info >></a>';
	else
		return '<b>'+content[0]+'</b><br /><a href="'+content[2]+'" target="_top"><img src="'+content[1]+'" border="0"><br />Maggiori info >></a>';

}

function next_pos(){
	var start = pos[0];
	for(var i=0; i<3; i++){
		if( pos[i]+1 < offerte.length ){
			pos[i] = pos[i] + 1;
		}else{
			pos[i] = 0;							
		}
	}
}

function back_pos(){
	var start = pos[0];
	for(var i=0; i<3; i++){
		if( pos[i]-1 < 0 ){
			pos[i] = (offerte.length - 1);
		}else{
			pos[i] = pos[i]-1;							
		}
	}
}

function next(){
	next_pos();
	document.getElementById("div1").innerHTML = create_html(offerte[pos[0]]);
	document.getElementById("div2").innerHTML = create_html(offerte[pos[1]]);
	document.getElementById("div3").innerHTML = create_html(offerte[pos[2]]);
}

function back(){
	back_pos();
	document.getElementById("div1").innerHTML = create_html(offerte[pos[0]]);
	document.getElementById("div2").innerHTML = create_html(offerte[pos[1]]);
	document.getElementById("div3").innerHTML = create_html(offerte[pos[2]]);
}