function zmenag(t,obr)
{
t.src=obr;
}

function tisk(url)
{
//f_url="tisk.php?cs="+cis+"&tisk=1";
f_url="tisk.php?"+url+"&tisk=1";
window.open(f_url,'','');
}

function tiskzobr()
{
print();
}

function zobraz(cis,par)
{
f_url="zobraz.php?cz="+cis+par;
window.open(f_url,'','width=700,height=500,top=5,left=5,toolbar=yes,menubar=no,statusbar=no,resizable=yes,scrollbars=yes');
}

function obrazek(fsb,fx,fy)
{
fy=fy;
f_url="obr.php?obr="+fsb;
window.open(f_url,'','width='+fx+',height='+fy+',top=5,left=5,toolbar=no, location=no, directories=no, status=no, scrollbars=no');
}

// prepina display block/none prednaeho elementu
function switchDisplay(sElementID) {
    oElement = document.getElementById(sElementID);
    if (oElement == null) { return }
    oElement.style.display = (oElement.style.display == 'block' ? 'none' : 'block');
}

// nastavi menu po nahrani stranky
function setMenu (sElementID) {
    if (sElementID == '') { return }
    oElement = document.getElementById(sElementID);
    if (oElement == null) { return }
    oElement.style.display = 'block' ;
}


setInterval("setTime()", 1000);

// vypisuje aktualni cas do span id=current_time
function setTime () {
    oElement = document.getElementById('current_time');
    if (oElement == null) { return }

    var curtime = new Date();
    var curhour = curtime.getHours();
    var curmin = curtime.getMinutes();
    var cursec = curtime.getSeconds();
    var time = "";

    if(curhour == 0) curhour = 12;
    time = curhour + ":" +
         (curmin < 10 ? "0" : "") + curmin;
/*    time = (curhour > 12 ? curhour - 12 : curhour) + ":" +
         (curmin < 10 ? "0" : "") + curmin + ":" +
         (cursec < 10 ? "0" : "") + cursec + " " +
         (curhour > 12 ? "PM" : "AM");*/

    oElement.innerHTML = time;
}

// vypisuje aktualni cas do span id=current_date
function sGetDate () {

    var curtime = new Date();
    var curday = curtime.getDate();
    var curmonth = curtime.getMonth();
    var curyear = curtime.getFullYear();
    var time = "";

    time = (curday) + "." +
         (curmonth+1) + "." +
         (curyear);

    return time;
}

// kontrola formu pro vyhledavani
function kontr_form()
{
    oFldText = document.getElementById('input_hledany_text');

    if (oFldText.value.length<3 ) {
	   alert("Zadejte pro hledání minimálně 3 znaky");
	   oFldText.select();
	   oFldText.focus();
	   return false;
	}
    return true;
}