// return "id" object on all browsers
function getObject(id) {
	if(document.getElementById) {
		obj = document.getElementById(id);
	}
	else if(document.all) {
		obj = document.all.item(id);
	}
	else {
		obj = null;
	}
	return obj;
}

// show "pane#" and set "tab#" as active
function showTab(id) {
	hideTab();
	activeTab = id;
	getObject("tab" + id).className = "tabActive";
	getObject("pane" + id).className = "tabPaneActive";
}
// hide active pane
function hideTab() {
	getObject("pane" + activeTab).className = "tabPane";
	getObject("tab" + activeTab).className = "tab";
}

// set initial tab
activeTab = 1;