//JavaScript

var t;

var dom = (document.getElementById) ? true : false;
var nn4 = (document.layers) ? true : false;
var ie4 = (document.all && !dom) ? true : false;

function show(obj)
{
	if(dom)
		document.getElementById(obj).style.visibility = 'visible';
	else if(ie4)
		document.all[obj].style.visibility = 'visible';
	else if(nn4)
		document.layers[obj].visibility = 'show';
	t = true;
}

function hide(obj)
{
	if(dom)
		document.getElementById(obj).style.visibility = 'hidden';
	else if(ie4)
		document.all[obj].style.visibility = 'hidden';
	else if(nn4)
		document.layers[obj].visibility = 'hide';
}

function swp(obj, c)
{
	if(dom)
		document.getElementById(obj).style.background = c;
	else if(ie4)
		document.all[obj].style.background = c;
	else if(nn4)
		document.layers[obj].background = c;
}