function mostrar(id)
{
    if (id=="bg_newsletter")
    {
        if (document.getElementById(id).style.display == "block")
 	    {
		    document.getElementById(id).style.display = "none";
		    document.getElementById("mostrar_box_indique").style.display = "none";
    	}
	     else
 	    {
    	    document.getElementById(id).style.display = "block";
    	    document.getElementById("mostrar_box_indique").style.display = "none";
	    }
	}
	else
	{
	    if (document.getElementById(id).style.display == "block")
        {
	        document.getElementById(id).style.display = "none";
	        document.getElementById("bg_newsletter").style.display = "none";
	    }
         else
        {
	        document.getElementById(id).style.display = "block";
	        document.getElementById("bg_newsletter").style.display = "none";
        }
    }
}