// otevření okna s obrázkem
//------------------------------------------------------------------------------
function openwindow (url, width, height)
{
  var browser = navigator.appName;
  var verze = parseInt(navigator.appVersion);
  var top, left;
  if ((browser == "Microsoft Internet Explorer" & verze >= 4) | (browser == "Netscape" & verze >= 4))
  {
    top = (screen.height/2) - (height/2) - 40;
    left = (screen.width/2) - (width/2) - 40;
  }
  else
  {
    top = 0;
    left = 0;
  }
  imgwindow = window.open (url,'','width='+width+', height='+height+', top='+top+', left='+left+', toolbar=0, directories=0, status=0, menubar=0, scrollbars=0, resizable=1');
  imgwindow.focus();
}

// skrytí / zobrazení divu
//------------------------------------------------------------------------------
function show_hide_div (id, div_id)
{
  if (document.getElementById(id).value == '0')
    document.getElementById(div_id).style.display='block';
  else
    document.getElementById(div_id).style.display='none';
}

// vytvoření emailu
//------------------------------------------------------------------------------
function make_email (email)
{
  var arr = email.split (' [z] ');
  if (arr.length == 1) document.write ("nemá");
  else document.write ("<a href='mailto:" + arr[0] + "@" + arr[1] + "'>" + arr[0] + "@" + arr[1] + "</a>");
}

// vkládání do formulářů
//------------------------------------------------------------------------------
function insert_tag (id, tag, tag2)
{
 var obj = document.getElementById(id);
 obj.focus();
 if (document.selection)
 {
   var textrange = document.selection.createRange();
   textrange.text = tag + textrange.text + tag2;
 }
 else if  (obj.selectionStart || obj.selectionStart == '0')
   obj.value = obj.value.substring(0,obj.selectionStart) + tag + tag2 + obj.value.substring(obj.selectionStart, obj.value.length);
 else
  obj.value += tag;
}