var initPause = 2000; // 3 secondi
var slideSpeed = 5;
var slideTimeBetweenSteps = 40;
var scrollingContainer = false;
var scrollingContent = false;
var containerHeight;
var contentHeight;	

var contentObjects = new Array();
var originalslideSpeed = false;

function slideContent(containerId){
	var topPos = contentObjects[containerId]['objRef'].style.top.replace(/[^\-0-9]/g,'');
	topPos = topPos - contentObjects[containerId]['slideSpeed'];
	if(topPos/1 + contentObjects[containerId]['contentHeight']/1<0)topPos = contentObjects[containerId]['containerHeight'];
	contentObjects[containerId]['objRef'].style.top = topPos + 'px';
	setTimeout('slideContent("' + containerId + '")',slideTimeBetweenSteps);
}

function stopSliding(){
	var containerId = this.id;
	contentObjects[containerId]['slideSpeed'] = 0;	
}

function restartSliding(){
	var containerId = this.id;
	contentObjects[containerId]['slideSpeed'] = contentObjects[containerId]['originalSpeed'];
}

function initSlidingContent(containerId,slideSpeed){
	scrollingContainer = document.getElementById(containerId);
	scrollingContent = scrollingContainer.getElementsByTagName('ul')[0];
	
	scrollingContainer.style.position = 'relative';
	scrollingContainer.style.overflow = 'hidden';
	scrollingContent.style.position = 'relative';
	
	scrollingContainer.onmouseover = stopSliding;
	scrollingContainer.onmouseout = restartSliding;
	
	originalslideSpeed = slideSpeed;
	
	scrollingContent.style.top = '0px';
	
	var contentH=scrollingContent.offsetHeight;
	var containerH=scrollingContainer.clientHeight;
	
	contentObjects[containerId] = new Array();
	contentObjects[containerId]['objRef'] = scrollingContent;
	contentObjects[containerId]['contentHeight'] = contentH;
	contentObjects[containerId]['containerHeight'] = containerH;
	contentObjects[containerId]['slideSpeed'] = slideSpeed;
	contentObjects[containerId]['originalSpeed'] = slideSpeed;
	
	if(contentH>containerH)setTimeout(function(){slideContent(containerId)},initPause);
}