// ======= Tabs
var lastTabId = '1';

function ShowTab(tabId)
{
	// deactivate last tab
	document.getElementById('panel_' + lastTabId).className = 'hide';
	document.getElementById('tab_' + lastTabId).className = 'tab_inactive';

	// activate current tab
	document.getElementById('panel_' + tabId).className = 'show';
	document.getElementById('tab_' + tabId).className = 'tab_active';

	// set last element
	lastTabId = tabId;
}