function killErrors() {
return true;
}
window.onerror = killErrors;
function disp(n,sum) {
	for (var i=1;i<=sum;i++) {
	document.getElementById("nav"+i).style.display="none";
	}
	document.getElementById("nav"+n).style.display="block";
}
function disp1(n,sum,name) {
	for (var i=1;i<=sum;i++) {
	document.getElementById(name+i).className="";
	document.getElementById(name+"_"+i).style.display="none";
	}
	document.getElementById(name+n).className="c";
	document.getElementById(name+"_"+n).style.display="block";
}