function showCBForm(layer_id) 
{
	var FormLayer = this.document.getElementById(layer_id);
	if (FormLayer.style.display=="block") 
	{
        FormLayer.style.display="none";
    }
	else
	{
		FormLayer.style.display="block";
	}
}


function hideCBError() 
{
	var ErrorLayer = this.document.getElementById('callback_error');
	ErrorLayer.style.display="none";
}

function setButtonClass(b_id)
{
	var Button = document.getElementById(b_id);
	if (Button.className=="callback") 
	{
        Button.className="callback_active";
    }
	else
	{
		Button.className="callback";
	}
}

function toggleForm ()
{
	
	showCBForm("callback_layer");
	hideCBError();
	setButtonClass('cbbutton');
}