function check(submit) {
    var error = true;
    var nameField = document.getElementById('name');
    error = controlItem(nameField,'name','Nevyplnili jste jméno.',error);
    var phoneField = document.getElementById('tel');
    error = controlItem(phoneField,'phone','Nevyplnili jste telefon.',error);
    var emailField = document.getElementById('mail');
    error = controlItem(emailField,'mail','Nevyplnili jste email.',error);
    var emailField = document.getElementById('masaz');
    error = controlItem(emailField,'masaz','Nevyplnili jste vybranou masáž.',error);
    var emailField = document.getElementById('termin');
    error = controlItem(emailField,'termin','Nevyplnili jste termín masáže.',error);        
    return(error);
  }

  function controlItem(item,name,text,error) {
    var background_error = '#CDE5E6';
    var border_error = '1px solid #99C9D9';
    var color_error = '#297084';
    var background = '#FFFFFF';
    var border = '1px solid #99C9D9';
    var color = '#297084';  
    if (!item.value.length || item.value=='@') {
      item.style.background = background_error;
      item.style.border = border_error;
      item.style.color = color_error;
      item.focus();
      warningId = 'script-warning-'+name;
      warning = document.getElementById(warningId);
      if (warning == null){
        newP = document.createElement('div');
        newP.className='script-warning';
        newP.id=warningId;      
        newP.innerHTML='<p>'+text+'</p>'; 
        item.parentNode.insertBefore(newP, item.parentNode.lastChild);
      }
      else
        warning.style.display = 'block';
      error = false;
    } else {
      item.style.background = background;
      item.style.border = border;
      item.style.color = color;
      warningId = 'script-warning-'+name;
      warning = document.getElementById(warningId);
      if (warning != null){
        warning.style.display = 'none';
      }  
    }
    return (error);
  }