var tabs = new Array('tab1', 'tab2', 'tab3', 'tab4');

function activateTab(tab)
{
	for (i = 0; i < tabs.length; i++)
	{
		if (document.getElementById(tabs[i]))
		{
			document.getElementById(tabs[i]).style.display = 'none';
			document.getElementById('link_' + tabs[i]).className= 'disabled_link_' + tabs[i];
		}
	}
	document.getElementById(tab).style.display = 'block';
	document.getElementById('link_' + tab).className= 'active_link_' + tab;
}

var tabes = new Array('tabe1', 'tabe2', 'tabe3');

function offerTab(tabe)
{
	for (i = 0; i < tabes.length; i++)
	{
		if (document.getElementById(tabes[i]))
		{
			document.getElementById(tabes[i]).style.display = 'none';
			document.getElementById('link_' + tabes[i]).className= 'disabled_link_' + tabes[i];
		}
	}
	document.getElementById(tabe).style.display = 'block';
	document.getElementById('link_' + tabe).className= 'active_link_' + tabe;
}