/* math */

	function inarray(co, kde) {
		var len = kde.length;
		var rslt = -1;
		var i=0;
		while ( i < len && rslt==-1 ) {
			if (kde[i] == co) rslt = i;
			i++;
		}
		return rslt!=-1 ? rslt : false;
	}

	function round(cislo, prec) {
		var zaklad = Math.floor(cislo);
		if (zaklad == cislo) return zaklad;
		var desmista = cislo - zaklad;
		var exp = Math.pow(10, prec);
		desmista = Math.round(desmista*exp) / exp;
		return zaklad + desmista;
	}

/* bloky */

	function givefocus() {
		blok = document.getElementById('takefocus');
		if (blok != null) blok.focus();
		return true;
	}

	function hide(name) {
		blok = document.getElementById(name);
		if (!blok) return false;
		blok.style.display = 'none';
	}

	function show(name) {
		blok = document.getElementById(name);
		if (!blok) return false;
		blok.style.display = 'block';
	}

	function mailto(name, domain) {
		if (name == '' || domain == undefined || domain == '') return '';
		return(document.location.href="mailto:"+name+"@"+domain);
	}

	function emailsplit(name, domain) {
		if (name == '' || domain == undefined || domain == '') return '';
		return(name+"@"+domain);
	}

	function catchkeypress(e) {
		var pressedKey = ("undefined" == typeof (e)) ? event.keyCode : e.keyCode ;
/*		if (pressedKey == "27") { // ASCII code of the ESC key
			alert('Zmackls ESC. Proc?');
		}
*/		return true;
	}

/* windows */

	function OpenWindow(url, name) {
		return window.open(url, name);
	}

	function openwindow(url, name) {
		return OpenWindow(url, name);
	}

	function closeandredirect(url) {
		window.opener.document.location.href = url;
		window.close();
		return true;
	}

	function redirect(url) {
		document.location.href=url;
		return true;
	}

	function delconfirm() {
		return window.confirm('Opravdu smazat?');
	}

/*	nejede, hazi rekurzi v mozille
	function confirm(zprava) {
		if (zprava == undefined) zprava = 'Jste si jist?';
		return window.confirm(zprava);
	}
*/
	function doconfirm() {
		return window.confirm('Jste si jist?');
	}

	var delay = 0;
	var andelay = 0;
	var dl = false;
	var dl2 = false;
	var derror = false;

	function countdown() {
		if (delay > 0 || andelay > 0)   {
			if (derror) derror.innerHTML = showerror(delay);
			if (dl2) dl2.innerHTML = showanerror(andelay);
			if (delay>0) delay--;
			if (andelay>0) andelay--;
			setTimeout('countdown()', 1000);
		}
		else {
			if (derror) derror.innerHTML = '';
			if (dl) dl.innerHTML = '';
			if (dl2)	dl2.innerHTML = '';
		}
	}

	function initdelay() {
		dl = document.getElementById('delay');
		derror = document.getElementById('derror');
		dl2 = document.getElementById('anketadelay');
		return true;
	}
	
	function showerror(d) {
		return "Další příspěvek můžete odeslat za "+showtimebysec(d)+".";
	}
	function showanerror(d) {
		return "Znova kliknout na tuto anketu můžete za "+showtimebysec(d)+".";
	}

	function showtimebysec(s) {
		var dnu = Math.floor(s / 86400);
		s -= dnu*86400;
		var hod = Math.floor(s / 3660);
		s -= hod*3660;
		var min = Math.floor(s / 60);
		s -= min*60;
		var sek = s;
		var result = '';

		if (dnu>=1) result += dnu+" "+sklonuj(dnu,"den","dny","dnů")+", ";
		if (hod>=1) result += hod+" "+sklonuj(hod,"hodinu","hodiny","hodin")+", ";
		if (min>=1) result += min+" "+sklonuj(min,"minutu","minuty","minut")+" a ";
		result += sek+" "+sklonuj(sek,"sekundu","sekundy","sekund");

		return result;
	}

	function sklonuj(pocet, jeden, dva, petavic) {
		if (pocet == 0 || pocet >= 5 ) return petavic;
		if	(pocet > 1 && pocet < 5) return dva;
		else return jeden;
	}