function fold() {
	var obj=document.getElementById("hidden");
	if(obj.style.display=="none") { obj.style.display="block";}
	else{obj.style.display="none";};
	}
function swapIn(obj){
	document.images[obj.name].src='css/img/'+obj.name+'-hover.png';
	}
function swapOut(obj){
	document.images[obj.name].src='css/img/'+obj.name+'.png';
	}
function unfold(num) {
	var parall=document.getElementsByTagName("span");
	var par = new Array();
	for (i=0; i<parall.length; i++) {
		if (parall[i].className=='fold') { par.push(parall[i]); }
		}
	for (i=0; i<par.length; i++) {
		if (num != -1) {
			par[i].style.display ="none";
			}
		}
	par[num].style.display="block";
	window.scrollTo(0,0);
	}