version = parseInt(navigator.appVersion);
valid = (navigator.appName=="Netscape" && version>2) ||
		(navigator.appName=="Microsoft Internet Explorer" && version>3);

if(valid)
{
	var arrowoff = new Image(4, 7);
	arrowoff.src = "/includes/images/arrowoff.gif";
	var arrowon = new Image(4, 7);
	arrowon.src = "/includes/images/arrowon.gif";
}

function over(item)
{
	if(valid) document[item].src = (document[item].src==arrowoff.src ? arrowon.src : arrowoff.src);
	window.status = arguments.length==1 ? "" : arguments[1];
	return true;
}

function jump(where)
{
	if(where.selectedIndex != 0)
		location.href = where.options[where.selectedIndex].value;
}

function stat()
{
	window.status = arguments.length==0 ? "" : arguments[0];
	return true;
}

function isDigit()
{
	key = window.event.keyCode;
	return (arguments.lenght==0) ? (key>=48 && key<=57) : ((key>=48 && key<=57) || arguments[0]==key); 
}

function error(err)
{
	window.alert(err);
	if(arguments.length>1) eval("document." + arguments[1]).focus();
	return false;
}

function ask(question)
{
	return window.confirm(question);
}