function formValidator(theForm) {
  re = /^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,4}$/;
  if ( theForm.email.value.search(re) ) {
    alert("Nekorektná e-mail adresa!!!");
    theForm.email.focus();
    return (false);
  }
    return (true);
}

//Generating Pop-up Preview for images
function createPage(titleName, imageName, x, y)
{
  //Creating new pagevar
  pp = window.open("", "imagePreview", "toolbar=no, scrollbars=yes, resizable=no, height=" + y + ",width=" + x, false);
  pp.document.open()
  //Adding HTML opening tag with <HEAD> … </HEAD> portion
  pp.document.writeln('<html><head><meta http-equiv="Content-type" content="text/html; charset=windows-1250"><title>'+titleName+'</title></head>')
  //Adding Body Tag
  pp.document.writeln('<body bottomMargin="0" leftMargin="0" topMargin="0" rightMargin="0" onClick="javascript:window.close()">');
  pp.document.writeln('<center><h1>'+titleName+'</h1><img src="'+imageName+'"></center>');
  pp.document.writeln('</body></html>');
  pp.document.close()
  if (window.focus) {pp.focus()}
}

function toggleDiv(elparent,element){
  var par,el;
  par = document.getElementById(elparent);
  var el = par.getElementsByTagName("ul");
  for(var i = 0; i < el.length; i++)
  {
    if(el[i].id == element) {
      el[i].style.display = 'block';
    } else {
      el[i].style.display = 'none';
    }
  }
}

function toggleDiv2(element){
  var el;
  el = document.getElementById(element);
  if(el.style.display != 'block') {
    el.style.display = 'block';
  }
  else {
    el.style.display = 'none';
  }
}
