var i=0;

function getElementsByClassName(classname, node)  { 
	if(!node) node = document.getElementsByTagName("body")[0];
	var a = [];    
	var re = new RegExp('\\b' + classname + '\\b');
	var els = node.getElementsByTagName("*");
	for(var i=0,j=els.length; i<j; i++)
	if(re.test(els[i].className))a.push(els[i]);    return a;
}

function start_slideshow() {
var wait = 5000;
timer=setInterval("SlideShow();", wait);  // This is a javascript function which acts as a timer.
}

function SlideShow(notizie) {
	vettore=getElementsByClassName('notizie');
	if (vettore.length>1){
	Effect.SlideUp(vettore[i], { duration:0.6  });
	i++;
	if (i == vettore.length) i = 0;
	Effect.SlideDown(vettore[i], { duration:0.6,  delay:0.5 });
	}

}

function getPageSize(){
	        
	     var xScroll, yScroll;
		
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		
		var windowWidth, windowHeight;
		
		if (self.innerHeight) {	// all except Explorer
			if(document.documentElement.clientWidth){
				windowWidth = document.documentElement.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		
		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
	
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){	
			pageWidth = xScroll;		
		} else {
			pageWidth = windowWidth;
		}

		return [pageWidth,pageHeight];
	}

function adattaOverlay(id){
var arrayPageSize = this.getPageSize();
 $(id).setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });	
	
}