function changeTab(show_id, hide_id) {
	var show_tab_id = show_id+"-tab";
	var elements_to_hide_count = hide_id.length;
	if (document.getElementById(show_id).className == "tab-content-invisible") {
		document.getElementById(show_id).className = "tab-content-visible";
		document.getElementById(show_id+"-tab").className = "active";
		for (var i = 0; i <= elements_to_hide_count; i++) {
			document.getElementById(hide_id[i]).className = "tab-content-invisible";
			document.getElementById(hide_id[i]+"-tab").className = "inactive";
		}
	}
}

function showMail(login, server) {
	email = login +  "@" + server;
	document.write('<a href="mailto:'+email+'">'+email+'</a>');
}