function hldef(a) {
if ( a == 0 )
{
if ( document.hledani.text.value == 'zadejte slovo' ) {document.hledani.text.value = '';}
}
if ( a == 1 )
{
if ( document.hledani.text.value == '' ) {document.hledani.text.value = 'zadejte slovo';}
}
}

function logbox_on()
{
var box = document.getElementById('log-box');
box.style.display = '';
//var boxt = setTimeout("logbox_off()", 10000);
}

function logbox_off()
{
document.getElementById('log-box').style.display = 'none';
return true;
}

function send_xmlhttprequest(state_change, method, url, content, headers) {
    var xmlhttp = (window.XMLHttpRequest ? new XMLHttpRequest() : (window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : false));
    if (!xmlhttp) {
        return false;
    }
    xmlhttp.open(method, url);
    xmlhttp.onreadystatechange = function () {
        state_change(xmlhttp);
    };
    if (headers) {
        for (var key in headers) {
            xmlhttp.setRequestHeader(key, headers[key]);
        }
    }
    xmlhttp.send(content);
    return true;
}




function chklogin() {
var hledane = document.regemail.uziv.value;
var v = document.regemail.domena.selectedIndex;
if (hledane.length>0 && v>0)
{
povoleno = /^[a-zA-Z0-9\._-]+$/;
if (!povoleno.test(hledane))
{ 
alert("Uživatelské jméno obsahuje nepovolené znaky.");
document.regemail.uziv.focus();
return false;
}
var dom = document.regemail.domena.options[v].value;
var slovo = '';
var tm = new Date();
var chk = tm.getTime()+10;
  if (hledane=='')  {
  	slovo = '';
  	document.getElementById('login_st').innerHTML='';
  	}
else {
	if (slovo == hledane) {
		return false;
	}
	slovo = hledane;
	setTimeout(function () {
		if (slovo != hledane) {
			return false;
		}
		send_xmlhttprequest(function (xmlhttp) {
			if (xmlhttp.readyState == 4 && slovo == hledane) {
				document.getElementById('login_st').innerHTML = xmlhttp.responseText;
			}
		}, 'GET', '_chk_email_uziv.php?chk='+chk+'&domena='+dom+'&login='+encodeURIComponent(slovo));
	}, 250);
}
}
else {document.getElementById('login_st').innerHTML='';}
}