showFeature = function(){
        nr='feature';
	if (document.layers)
	{
		document.layers['feature'].display = 'block';
	}
	else if (document.all)
	{
		document.all['feature'].style.display = 'block';
	}
	else if (document.getElementById)
	{
		document.getElementById('feature').style.display = 'block';
	}
}
hideFeature = function(){
        nr='feature';
	if (document.layers)
	{
		document.layers['feature'].display = 'none';
	}
	else if (document.all)
	{
		document.all['feature'].style.display = 'none';
	}
	else if (document.getElementById)
	{
		document.getElementById('feature').style.display = 'none';
	}
}