function check()
{

var retezec = "";
 if(document.getElementById('email').value == '') 
 {
   retezec = retezec + 'Zapomněli jste vyplnit pole e-mail\n\n';
   
 }
 if(document.getElementById('textarea').value == '') 
 {
   retezec = retezec + 'Zapomněli jste vyplnit pole vzkaz\n\n';
 }
  
 if (retezec != "")
 {
  return confirm(retezec + 'Chcete pokračovat ??');
 } else {
  return true;
 }

}

function otevri(kam)
{
 var msg = window.open(kam, 'Zobrazit', 'resizable=no,top=100,left=100,menubar=0,width=400,height=400,scrollbars=0,status=0')
}

function zavri_okno()
{
 var msg = window.close()
}

function obr()
{
  if((document.getElementById('obr').width) > (document.getElementById('obr').height))
  {
    var width = document.getElementById('obr').width + 10;
    var height = document.getElementById('obr').height + 50;
    window.resizeTo(width, height); 
  } else {
    var width = document.getElementById('obr').width + 10;
    var height = document.getElementById('obr').height + 50;
    window.resizeTo(width, height); 
  }
}