function sfswitcher(option) {
if (document.getElementById) {
	navRoot = document.getElementById("images");
	for (i=0; i<navRoot.childNodes.length; i++) {
		node = navRoot.childNodes[i];
		if (node.nodeName=="SPAN") {
		node.style.display="none";
			}
   		}
  	}		
	menu = document.getElementById("thumbs");
	j=0;
	for (i=0; i<menu.childNodes.length; i++) {
		thelink = menu.childNodes[i];
		if (thelink.nodeName=="SPAN") {
			j++;
			thelink.onclick=function() {		
			for (i=1; i<=j; i++) {
			hide='image'+i;
			document.getElementById(hide).style.display="none";
				if (document.getElementById('about')) {
				document.getElementById('about').style.display="none";
				}
			}
			no=this.id.substr(4,2);
			show='image'+no;
			document.getElementById(show).style.display="block";
				}
			}
	if (option) {document.getElementById(option).style.display="block";}
	
	backtotop = document.getElementsByTagName('address');
	for (var x=0;x<backtotop.length;x++) {
		backtotop[x].style.display="none";
	}		
	
	}

 }