function toggle_display(obj_id)
{
	if (document.getElementById)
	{
		var obj = document.getElementById(obj_id);
		if (obj.style.display == '' || obj.style.display == 'none')
		{
			var state = 'block';
		} 
		else 
		{
			var state = 'none';
		}
		
		obj.style.display = state;
	}
	return false;
}