var newsTitles = new Array();
	var total = 5;
	var last = total - 1;
	var upButton;
	var downButton
	var dy = 5;
	var timer;

	function displayButtons(){
		if(newsTitles[0]["top"] == 30){
			upButton.style.display = "none";
		}else{
			upButton.style.display = "block";
		}
		
		if(newsTitles[last]["top"] == 30){
			downButton.style.display = "none";
		}else{
			downButton.style.display = "block";
		}
	}

	function init(){
		MM_preloadImages('../imagenes/btn02b.jpg','../imagenes/btn03b.jpg','../imagenes/btn04b.jpg','../imagenes/btn05b.jpg','../imagenes/up-button-2.jpg','../imagenes/down-button-2.jpg');
		upButton = document.getElementById('upButton');
		downButton = document.getElementById('downButton');
		for(i=0;i<total;i++){
			j = i+1;
			name = "newsTitle" + j;
			newsTitles[i] = { "name" : name , "id" : document.getElementById(name) };
		}
		newsTitles[0]["top"] = 30;
		for(i=1;i<total;i++){
			newsTitles[i]["top"] = newsTitles[i-1].top + 125;
		}
		displayButtons();
	}
	
	function move(speed,j){
		for(i=0;i<total;i++){
			newsTitles[i].top += speed;
			newsTitles[i].id.style.top = newsTitles[i].top + 'px';
		}
		j++;
		if(j<25){
			timer = setTimeout('move('+speed+','+j+')',25);
		}else{
			displayButtons();
			return true;
		}
	}
	
	function scroll(dir){
		switch(dir){
			case "up":
				move(dy,0);
				break;
			case "down":
				move(-1*dy,0);
				break;
		}
	}
	
	function swapImages(frame,image){
		frame.style.backgroundImage = 'url('+image+')';
	}