var boxwidth = 75;
var content=new Array(total);

//get content for all slides
	for (i=0; i<total;i++){
		document.getElementById(prefix + i).style.display = 'none';
		content[i]=document.getElementById(prefix + i).innerHTML;
	}

//show first 3 slides
	for (i=0;i<numToShow;i++){
			document.getElementById(prefix + i).style.display = 'block';
	}
	
function nextScroll(act){
	if(numToShow<=total){
		firstVisible+=act;
		firstVisible=(firstVisible>(total-1))?0:firstVisible;
		firstVisible=(firstVisible<0)?total:firstVisible;
		var visible=firstVisible;
		var j=0;
		for (i=firstVisible; i<(firstVisible+numToShow); i++){
			visible=(visible>(total-1))?0:visible;
			document.getElementById(prefix + j).innerHTML= content[visible];
			visible++;
			j++;
		}
	}
}