function popWindow (url,w,h)
{
	var pWin = window.open(url,'pWin','width=' + w + ',height=' + h + ',scrollbars,resizable');
	pWin.moveTo(screen.width/2-w/2,screen.height/2-h/2);
	pWin.focus();
}

function validateLogin(f)
{
	if (f.UN.value == '')
	{
		window.alert('You must enter your Username to continue');
		f.UN.focus();
		return false;
	}
	
	if (f.PW.value == '')
	{
		window.alert('You must enter your Password to continue');
		f.PW.focus();
		return false;
	}
	
	return true;
}

function showLayer(inLayer)
{
	inLayer.style.visibility = 'visible';
}

function hideLayer(inLayer)
{
	inLayer.style.visibility = 'hidden';
}

function placeLayer(inLayer,x,y)
{
	inLayer.style.left = x;
	inLayer.style.top = y;
}