function add_tag(id, tag) {
	old = document.getElementById(id).value;
	document.getElementById(id).value = "<" + tag + "></" + tag + ">" + old;
	countlt();
}
function add_smile(id, smile) {
	old = document.getElementById(id).value;
	document.getElementById(id).value = old + smile;
	countlt();
}
function countlt() {
	var cnt = document.getElementById("txt").value.length;
	document.getElementById("leftlt").innerHTML = "Zbývá znaků: " + (500 - cnt);
}
function ch_pic(name,n) {
	document.getElementById(name).src = pic[n].src
}
function check_data(form) {
	if (form.nick.value=="" || form.txt.value=="") {
		alert ("Je třeba zadat jméno a text.");
		return false;
	} else {
		if (form.mail.value !="") {
			test = new RegExp("^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$");
			if (!test.test(form.mail.value)) {
				alert ("Chybně zadaný e-mail.");
				return false;
			}
		} else {
			test = new RegExp("[A-Z,a-z,0-9,Ě,ě,Š,š,Č,č,Ř,ř,Ž,ž,Ý,ý,Á,á,Í,í,É,é,Ů,ů,Ú,ú,Ó,ó,Ň,ň,Ď,ď,Ť,ť]$");
			if (!test.test(form.nick.value)) {
				alert ("Ve jméně se vyskytují nepovolené znaky.");
				return false;
			}
			return true;
		}
	}
}
function ch_graf() {
	x = document.getElementById("graf").selectedIndex;
	document.getElementById("graf_ip").src = "pics/graf.php?q=1" + document.getElementById("graf").options[x].value;
	document.getElementById("graf_pg").src = "pics/graf.php?q=2" + document.getElementById("graf").options[x].value;
}
function init_time() {
	var cas = new Date();
	var hours = cas.getHours();
	var minutes = cas.getMinutes();
	var oldSec = cas.getSeconds();
	var day = cas.getDate();
	var month = cas.getMonth();
	var year = cas.getYear();
	var m_name = new Array();
	m_name[0] = "Ledna";
	m_name[1] = "Února";
	m_name[2] = "Března";
	m_name[3] = "Dubna";
	m_name[4] = "Května";
	m_name[5] = "Června";
	m_name[6] = "Července";
	m_name[7] = "Srpna";
	m_name[8] = "Září";
	m_name[9] = "Října";
	m_name[10] = "Listopadu";
	m_name[11] = "Prosince";
	minutes = (minutes < 10) ? "0" + minutes : minutes + "";
	oldSec = (oldSec < 10) ? "0" + oldSec : oldSec + "";
	year = (year < 1900) ? year + 1900 : year + "";
	year = (year < 10) ? "0" + year : year + "";
	var time_show = hours + ":" + minutes + ":" + oldSec;
	var date_show = day + ". " + m_name[month] + " " + year;
	window.document.getElementById("cas").innerHTML = time_show;
	window.document.getElementById("datum").innerHTML = date_show;
}
function show_time() {
	var cas = new Date();
	var seconds = cas.getSeconds();
	var minutes = cas.getMinutes();
	var hours = cas.getHours();
	if (seconds != oldSec) {
		var oldSec = cas.getSeconds();
		seconds = (seconds < 10) ? "0" + seconds : seconds + ""
		minutes = (minutes < 10) ? "0" + minutes : minutes + "";
		if (seconds == "00") {
			init_time();
		}
		var time_show = hours + ":" + minutes + ":" + seconds;
		window.document.getElementById("cas").innerHTML = time_show;
	}
}