function top()
{

	$('html,body').animate({scrollTop: 0}, 1000);
	

} 

function showMesta(){      
  if($('.first_email').css('display')!='none'){
     $('.first_email').slideUp();
  }
  if($('.visible').css('display')!='none'){
     $('.visible').slideUp();
  }

  if($('.first_mesta').css('display')=='none'){
      $('.first_mesta').slideDown();
  }else{
      $('.first_mesta').slideUp();
  }
}

function showEmail(){
  if($('.first_mesta').css('display')!='none'){
     $('.first_mesta').slideUp();
  }

  if($('.first_email').css('display')=='none'){
      $('.first_email').slideDown();
  }else{
      $('.first_email').slideUp();
  }
  
  if($('.visible').css('display')=='none'){
      $('.visible').slideDown();
  }else{
      $('.visible').slideUp();
  }
}         

function IsNumeric(sText)
{
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;
   var i;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
      if(sText == '')
      {
         IsNumber = false;
      }
   return IsNumber;
   
}

function changeMnozstvi(element, nasobek, cena){ 
     var pocet = element.value;     
     if(!IsNumeric(pocet)||(pocet==''))
     {
        pocet = 0;
     }
     pocet = pocet * nasobek;
     $('.kredity').text(pocet);
     
     pocet = element.value;   
     pocet = pocet * cena;
     $('.objednavka_cena').text(number_format(pocet,0,',',' '));
}

function setCena(element, cena, mena){ 
     var sleva = cena - element.value;  
     
     if((!IsNumeric(element.value))||(sleva<1))
     {
        $('.cena').html('<p>'+cena+' '+mena+'</p>');
        $('#cena_strong').html('<p><strong>'+cena+' '+mena+'</strong></p>');
     }else{
        $('.cena').html('<p>'+sleva+' '+mena+'</p>');
        $('#cena_strong').html('<p><strong>'+sleva+' '+mena+'</strong></p>');
     }
}

function number_format(number, decimals, dec_point, thousands_sep) {
   
    number = (number+'').replace(',', '').replace(' ', '');
    var n = !isFinite(+number) ? 0 : +number, 
        prec = !isFinite(+decimals) ? 0 : Math.abs(decimals),
        sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep,        dec = (typeof dec_point === 'undefined') ? '.' : dec_point,
        s = '',
        toFixedFix = function (n, prec) {
            var k = Math.pow(10, prec);
            return '' + Math.round(n * k) / k;        };
    // Fix for IE parseFloat(0.55).toFixed(0) = 0;
    s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.');
    if (s[0].length > 3) {
        s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep);    }
    if ((s[1] || '').length < prec) {
        s[1] = s[1] || '';
        s[1] += new Array(prec - s[1].length + 1).join('0');
    }    return s.join(dec);
}