// JavaScript Document
function jeemail(adr){
  re = /^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$/;
  return adr.search(re) == 0;
}

function trim(str){
   return str.replace(/^\s*|\s*$/g,"");
}


function okno(a){
	var trenink=window.open(a, 'trenink', 'width=500, height=650, resizable=yes, scrollbars=yes'); 
	vyska = screen.height;
	sirka = screen.width;
	var levy = (sirka - 500)/2;
	var horni = (vyska - 650)/2
	trenink.moveTo(levy, horni);
	trenink.focus();
	return false;
}
function okno_help(a){
	var trenink=window.open(a, 'help', 'width=500, height=650, resizable=yes, scrollbars=yes'); 
	vyska = screen.height;
	sirka = screen.width;
	var levy = (sirka - 500)/2;
	var horni = (vyska - 570)/2
	trenink.moveTo(levy, horni);
	trenink.focus();
	return false;
}

function oknof(a, widthf, heightf){
	var trenink=window.open(a, '_blank', 'width='+widthf+', height='+heightf+', resizable=yes, scrollbars=yes'); 
	vyska = screen.height;
	sirka = screen.width;
	var levy = (sirka - widthf)/2;
	var horni = (vyska - heightf)/2
	trenink.moveTo(levy, horni);
	trenink.focus();
	return false;
}

function smazat(){
      var opravdu=confirm("Opravdu smazat?");
      if (opravdu)
      return true ;
      else
      return false ;
}
function opravdu(text){
      var opravdu=confirm(text);
      if (opravdu)
      return true ;
      else
      return false ;
}


//javascript funkce ekvivalent k PHP str_replace
function str_replace (search, replace, subject)
{
  var result = "";
  var  oldi = 0;
  for (i = subject.indexOf (search)
     ; i > -1
     ; i = subject.indexOf (search, i))
  {
    result += subject.substring (oldi, i);
    result += replace;
    i += search.length;
    oldi = i;
  }
  return result + subject.substring (oldi, subject.length);
}



function in_array(needle, haystack, strict) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: in_array('van', ['Kevin', 'van', 'Zonneveld']);
    // *     returns 1: true
 
    var found = false, key, strict = !!strict;
 
    for (key in haystack) {
        if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle)) {
            found = true;
            break;
        }
    }
 
    return found;
}

function explode( delimiter, string, limit ) {
    // http://kevin.vanzonneveld.net
    // +     original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +     improved by: kenneth
    // +     improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +     improved by: d3x
    // +     bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: explode(' ', 'Kevin van Zonneveld');
    // *     returns 1: {0: 'Kevin', 1: 'van', 2: 'Zonneveld'}
    // *     example 2: explode('=', 'a=bc=d', 2);
    // *     returns 2: ['a', 'bc=d']
 
    var emptyArray = { 0: '' };
    
    // third argument is not required
    if ( arguments.length < 2
        || typeof arguments[0] == 'undefined'
        || typeof arguments[1] == 'undefined' )
    {
        return null;
    }
 
    if ( delimiter === ''
        || delimiter === false
        || delimiter === null )
    {
        return false;
    }
 
    if ( typeof delimiter == 'function'
        || typeof delimiter == 'object'
        || typeof string == 'function'
        || typeof string == 'object' )
    {
        return emptyArray;
    }
 
    if ( delimiter === true ) {
        delimiter = '1';
    }
    
    if (!limit) {
        return string.toString().split(delimiter.toString());
    } else {
        // support for limit argument
        var splitted = string.toString().split(delimiter.toString());
        var partA = splitted.splice(0, limit - 1);
        var partB = splitted.join(delimiter.toString());
        partA.push(partB);
        return partA;
    }
}

function substr_count( haystack, needle, offset, length ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Onno Marsman
    // *     example 1: substr_count('Kevin van Zonneveld', 'e');
    // *     returns 1: 3
    // *     example 2: substr_count('Kevin van Zonneveld', 'K', 1);
    // *     returns 2: 0
    // *     example 3: substr_count('Kevin van Zonneveld', 'Z', 0, 10);
    // *     returns 3: false
 
    var pos = 0, cnt = 0;
 
    haystack += '';
    needle += '';
    if(isNaN(offset)) offset = 0;
    if(isNaN(length)) length = 0;
    offset--;
 
    while( (offset = haystack.indexOf(needle, offset+1)) != -1 ){
        if(length > 0 && (offset+needle.length) > length){
            return false;
        } else{
            cnt++;
        }
    }
 
    return cnt;
}

function strpos( haystack, needle, offset){
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Onno Marsman    
    // *     example 1: strpos('Kevin van Zonneveld', 'e', 5);
    // *     returns 1: 14
 
    var i = (haystack+'').indexOf( needle, offset ); 
    return i===-1 ? false : i;
}