function switchLayer(Layer_Name)
{
	var GECKO = document.getElementById? 1:0 ;
	var NS = document.layers? 1:0 ;
	var IE = document.all? 1:0 ;

	if (GECKO)
	{
		document.getElementById(Layer_Name).style.display=(document.getElementById(Layer_Name).style.display=='block') ? 'none' : 'block';
	}
	else if (NS)
	{
		document.layers[Layer_Name].display=(document.layers[Layer_Name].display=='block') ? 'none' : 'block';
	}
	else if (IE)
	{
		document.all[Layer_Name].style.display=(document.all[Layer_Name].style.display=='block') ? 'none' : 'block';
	}
}