//
    //  getPageSize()
    //
    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];
	}

incorso = 0;
luce=1;
function illuminazione(){ 
	if(incorso == 0)
		{
		incorso = 1;
		if(luce==1)
			spegni_luce();
		else
			accendi_luce();
		}
	 
		
	}
 
function spegni_luce(){
	 //imposto lo z-index dell'iphone sopra tutto per farlo accendere
	 $('iphone').style.zIndex='6';
	var arrayPageSize = getPageSize();
        $('oscura').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px'});
        

        //new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });
	
	 new Effect.Opacity('oscura', { from: 0.0, to: 0.8, duration: 1.5, afterFinish:function() {
					//
					incorso = 0;
					luce=0;
					
						} });
	 
	 //imposto lo z-index della link della lampada sopra il div che oscura
	 $('lampada').style.zIndex='6';
	} 
function accendi_luce(){
	 
	var arrayPageSize = getPageSize();
        $('oscura').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px'});
        

        //new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });
	
	 new Effect.Opacity('oscura', { from: 0.8, to: 0.0, duration: 1.5, 
					afterFinish:function() {
					//riattiva il sito sotto
					incorso = 0;
					luce=1;
					$('oscura').setStyle({ width: 0 + 'px', height: 0 + 'px'});
									
					 //re-imposto lo z-index dell'iphone sotto l'icona di facebook
					 $('iphone').style.zIndex='1';
					
						}});
	
	 //imposto lo z-index della link della lampada dietro l'eventuale popup
	 $('lampada').style.zIndex='2';
	}