function SequenceItem (picture, text){
	this.picture=picture;
	this.text=text;
}


function startTimer(){
	//alert("timer started");
	setTimeout("sequenceTimer();", 10);
}

function sequenceTimer(){
	//alert("timer");		
	setTimeout("sequenceTimer();", 2500);
	index1=nextItem(sequence1,index1,"picture_1","text_1");
	//index2=nextItem(sequence2,index2,"picture_2","text_2");
}

function nextItem(sequence,index,idPicture,idText){
	//alert("index="+index);
	//alert("sequence.length="+sequence.length);
	if(index>=sequence.length){
		index=0;
	}
	//alert("index="+index);
	replacePicture(document.getElementById(idPicture),sequence[index].picture,sequence[index].text);
	//replaceText(document.getElementById(idText),sequence[index].text);
	
	index=index+1;
	return index;
}

function replaceText(textElement,newText){
	//alert(">"+newText+"<");
	var txt = document.createTextNode(newText);
	var oldTxt = textElement.replaceChild(txt, textElement.firstChild);
}

function replacePicture(img,src,alt){
	img.src=src;
	img.alt=alt;
}