function popup(url, target)
{
	w = screen.width*(3/4);
	h = screen.height*(3/4);
	l = (screen.width-w)/2;
	t = (screen.height-h)/2;
	widthHeight = "width="+w+",height="+h+",left="+l+",top="+t+",menubar=no,resizable=yes,scrollbars=no,status=no,toolbar=no,location=no";
	window.open(url,target,widthHeight);
	return true
}

function openchat(oForm)
{
	if (oForm.nick.value.length == 0)
	{
		alert ('You have to fill in a nickname');
	}
	else
	{
		s = oForm.style.value + '?nick=' + oForm.nick.value;
		popup(s,'chatroom');
	}
	return false;
}

function parseQueryString () {
var str = str ? "" : document.location.search;
var query = str.charAt(0) == '?' ? str.substring(1) : str;
  var args = new Object();
  if (query) {
    var fields = query.split('&');
    for (var f = 0; f < fields.length; f++) {
      var field = fields[f].split('=');
      args[unescape(field[0].replace(/\+/g, ' '))] =  unescape(field[1].replace(/\+/g, ' '));
    }
  }
  return args;
}