function clickCredits(){
		var thediv=document.getElementById('usdisplaybox');
		var thedivbg=document.getElementById('usdisplayboxbg');
		if(thediv.style.display == "none"){
			var arrayPageSize = getPageSize();
			thedivbg.style.width = arrayPageSize[0] +"px";
			thedivbg.style.height = arrayPageSize[1] +"px";
			thediv.style.display = "block";
			thedivbg.style.display = "block";
			thediv.innerHTML = "<div class='usoverlay usmain'><div style='text-align:right;width:740px'><a href='javascript:;' onclick='clickCredits();'><img src='/opencms/site/system/modules/it.iconmedialab.locat/resources/img/btn_chiudi.gif' alt='Chiudi' /></a></div><a href='http://www.iconmedialab.it' target='_blank' onclick='clickCredits();'><img src='/opencms/site/system/modules/it.iconmedialab.locat/resources/img/credits.gif' alt='Credits - Iconmedialab S.r.L' /></a></div></div>";
		}else{
			
			thediv.style.display = "none";
			thedivbg.style.display = "none";
			thediv.innerHTML = '';
		}
		return false;
	}
	
	//check page size
	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){ 
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { 
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		var windowWidth, windowHeight;
		if (self.innerHeight) {	
			if(document.documentElement.clientWidth){
				windowWidth = document.documentElement.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { 
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
		if(xScroll < windowWidth){	
			pageWidth = xScroll;		
		} else {
			pageWidth = windowWidth;
		}
		arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
		return arrayPageSize;
	}