function ref(object)
{
	if (document.getElementById)
	{
		return document.getElementById(object);
	}
	else if (document.all)
	{
		return eval('document.all.' + object);
	}
	else
	{
		return false;
	}
}

function toggle(object)
{
	image = ref(object + '_img');
	object = ref(object);
	if( object.style.display == 'none' )
	{
		object.style.display = '';
		image.src ='image/contract.gif';
	}
	else
	{
		object.style.display = 'none';
		image.src = 'image/expand.gif';
	}
}