var agt=navigator.userAgent.toLowerCase();
var is_major=parseInt(navigator.appVersion);
var is_nav=((agt.indexOf('mozilla') != -1) && (agt.indexOf('spoofer') == -1) && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera') == -1) && (agt.indexOf('webtv') == -1) && (agt.indexOf('hotjava') == -1));
var is_nav4up=(is_nav && (is_major >= 4));
var is_ie=((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie3=(is_ie && (is_major < 4));
var is_ie4=(is_ie && (is_major == 4) && (agt.indexOf("msie 4") != -1) );
var is_ie5up=(is_ie && !is_ie3 && !is_ie4);
function InsertEditText(element, text, pos)
{ element.value = element.value.slice(0, pos) + text + element.value.slice(pos);
}
function AddTag(tag)
{ var t1 = '[' + tag + ']', t2 = '[/' + tag + ']';
  if (is_ie5up)
  { if (document.selection)
    { document.getElementById('message').focus();
      var txt = document.getElementById('message').value;
      var str = document.selection.createRange();
      if (str.text == '') str.text = t1 + t2;
      else if (txt.indexOf(str.text) >= 0) str.text = t1 + str.text + t2;
      else document.getElementById('message').value = txt + t1 + t2;
      str.select();
    }
  }
  else if (is_nav4up || (typeof document.getElementById('message').selectionStart) != 'undefined')
  { var element = document.getElementById('message');
    var sel_start = element.selectionStart;
    var sel_end = element.selectionEnd;
    InsertEditText(element, t1, sel_start);
    InsertEditText(element, t2, sel_end+t1.length);
    element.selectionStart = sel_start;
    element.selectionEnd = sel_end+t1.length+t2.length;
    element.focus();
  }
  else document.getElementById('message').value = document.getElementById('message').value + t1 + t2;
}
function AddSmile(tag)
{ if (is_ie5up)
  { if (document.selection)
    { document.getElementById('message').focus();
      var txt = document.getElementById('message').value;
      var str = document.selection.createRange();
      if (str.text == '') str.text = tag;
      else if (txt.indexOf(str.text) >= 0) str.text = tag;
      else document.getElementById('message').value = txt + tag;
      str.select();
    }
  }
  else if (is_nav4up)
  { var element = document.getElementById('message');
    var sel_start = element.selectionStart;
    var sel_end = element.selectionEnd;
    InsertEditText(element, tag, sel_end);
    element.selectionStart = sel_start;
    element.selectionEnd = sel_end+tag.length;
    element.focus();
  }
  else document.getElementById('message').value = document.getElementById('message').value + tag;
}
function AddLogin(login)
{ login = '[b]' + login + '[/b], ';
  if (is_ie5up)
  { if (document.selection)
    { document.getElementById('message').focus();
      var txt = document.getElementById('message').value;
      var str = document.selection.createRange();
      if (str.text == '') str.text = login;
      else if (txt.indexOf(str.text) >= 0) str.text = login;
      else document.getElementById('message').value = txt + login;
      str.select();
    }
  }
  else if (is_nav4up)
  { var element = document.getElementById('message');
    var sel_start = element.selectionStart;
    var sel_end = element.selectionEnd;
    InsertEditText(element, login, sel_end);
    element.selectionStart = sel_start;
    element.selectionEnd = sel_end + login.length;
    element.focus();
  }
  else document.getElementById('message').value = document.getElementById('message').value + login;
}