function mostra(mydiv, show)
{
	var z_status = "1";
	var v_status = "visible";
	
	if(show==0) 
	{
		z_status = "-1";
		v_status = "hidden";
	}
	
	if(document.getElementById(mydiv)) document.getElementById(mydiv).style.zIndex = z_status;
	else if(document.layers[mydiv]) document.layers[mydiv].style.zIndex = z_status;
	else if(document.all[mydiv]) document.all[mydiv].style.zIndex = z_status;
	
	if(document.getElementById(mydiv)) document.getElementById(mydiv).style.visibility = v_status;
	else if(document.layers[mydiv]) document.layers[mydiv].style.visibility = v_status;
	else if(document.all[mydiv]) document.all[mydiv].style.visibility = v_status;
}