function form()
    {
    var chyba = 0;
    if(document.form.mail.value!="")
      {
      document.getElementById('mail_alert').innerHTML = "";
      document.getElementById('mail').style.color='#90b251';
      document.getElementById('maill').style.color='#484a47';
      document.getElementById('mail').style.backgroundColor='none';
      document.getElementById('mail').style.border='2px solid #90b251';//'1px solid #7FFFD4';
      }
    if(document.form.mail.value=="")
      {
      document.form.mail.focus();
      document.getElementById('mail_alert').innerHTML = " Vyplòte";
      document.getElementById('mail').style.color='#90b251';
      document.getElementById('maill').style.color='#90b251';
      document.getElementById('mail').style.backgroundColor='none';
      document.getElementById('mail').style.border='2px solid #90b251';
      var chyba = 1;
      }
    if(document.form.message.value!="")
      {
      document.getElementById('name_alert').innerHTML = "";
      document.getElementById('name').style.color='#90b251';
      document.getElementById('namel').style.color='#90b251';
      document.getElementById('name').style.backgroundColor='none';
      document.getElementById('name').style.border='2px solid #90b251';//'1px solid #7FFFD4';
      }
    if(document.form.message.value=="")
      {
      document.form.message.focus();
      document.getElementById('name_alert').innerHTML = " Vyplòte";
      document.getElementById('name').style.color='#90b251';
      document.getElementById('namel').style.color='#90b251';
      document.getElementById('name').style.backgroundColor='none';
      document.getElementById('name').style.border='2px solid #90b251';
      var chyba = 1;
      }
    if(document.form.surname.value!="")
      {
      document.getElementById('number_alert').innerHTML = "";
      document.getElementById('number').style.color='#90b251';
      document.getElementById('numberl').style.color='#90b251';
      document.getElementById('number').style.backgroundColor='none';
      document.getElementById('number').style.border='2px solid #90b251';//'1px solid #7FFFD4';
      }
    if(document.form.surname.value=="")
      {
      document.form.surname.focus();
      document.getElementById('number_alert').innerHTML = " Vyplòte";
      document.getElementById('number').style.color='#90b251';
      document.getElementById('numberl').style.color='#90b251';
      document.getElementById('number').style.backgroundColor='none';
      document.getElementById('number').style.border='2px solid #90b251';
      var chyba = 1;
      }
    if(document.form.surname.value!="")
      {
      document.getElementById('date2_alert').innerHTML = "";
      document.getElementById('date2').style.color='#90b251';
      document.getElementById('date2l').style.color='#90b251';
      document.getElementById('date2').style.backgroundColor='none';
      document.getElementById('date2').style.border='2px solid #90b251';//'1px solid #7FFFD4';
      }
    if(document.form.surname.value=="")
      {
      document.form.surname.focus();
      document.getElementById('date2_alert').innerHTML = " Vyplòte";
      document.getElementById('date2').style.color='#90b251';
      document.getElementById('date2l').style.color='#90b251';
      document.getElementById('date2').style.backgroundColor='none';
      document.getElementById('date2').style.border='2px solid #90b251';
      var chyba = 1;
      }
    if(document.form.name.value!="")
      {
      document.getElementById('date1_alert').innerHTML = "";
      document.getElementById('date1').style.color='#90b251';
      document.getElementById('date1l').style.color='#90b251';
      document.getElementById('date1').style.backgroundColor='none';
      document.getElementById('date1').style.border='2px solid #90b251';//'1px solid #7FFFD4';
      }
    if(document.form.name.value=="")
      {
      document.form.name.focus();
      document.getElementById('date1_alert').innerHTML = " Vyplòte";
      document.getElementById('date1').style.color='#90b251';
      document.getElementById('date1l').style.color='#90b251';
      document.getElementById('date1').style.backgroundColor='none';
      document.getElementById('date1').style.border='2px solid #90b251';
      var chyba = 1;
      }
    if (chyba==0) document.forms["form"].submit();
    }