function ShowTabPanel(panel)
{
		// hide active panel
		var e = document.getElementById(activeTabPanel);
		if (e)
		{
				e.style.display = 'none';
				var e = document.getElementById('tab-'+activeTabPanel);
				if (e) {
						e.className = 'tab';
				}
		}
		var e = document.getElementById(panel);
		if (e)
		{
				e.style.display = 'block';
				var e = document.getElementById('tab-'+panel);
				if (e)
				{
						e.className = 'tab-active';
				}
				activeTabPanel = panel;
		}
}