function prepareEventParameter(param)
{
  var cmds = new Array();
  if (param instanceof Array)
  {
    cmds = param;
  }
  else if (param instanceof Object)
  {
    cmds.push(param);
  }
  else if (typeof(param) == "string")
  {
    var p;
    var pa = (param.indexOf("{") == 0) ? param : "{"+param+"}";
    try
    {
      p = JSON.parse(pa);
      cmds.push(p);
    }
    catch(e)
    {
      alert(e);
      return
    }
  }
  else
  {
  }
  return (cmds.length > 0) ? cmds : false;
}
function executeEventParameter(cmds,ctrl)
{
  var nn;
  var obj = cmds[0]["obj"];
  if (typeof(ie) == "undefined") var ie = null;
  if ( obj.addEventListener )
  {
    for ( var i = 0; i < cmds.length; i++)
    {
      var arg = cmds[i];
      if (ctrl)
        arg["obj"].addEventListener(arg["evt"],arg["fkt"],arg["ctrl"]);
      else
        arg["obj"].removeEventListener(arg["evt"],arg["fkt"],arg["ctrl"]);
    }
    ie = false;
  }
  else if ( obj.attachEvent )
  {
    for ( var i = 0; i < cmds.length; i++ )
    {
      var arg = cmds[i];
      var evt;
      if ( arg["evt"] == "DOMMouseScroll" )
      {
        evt = "onmousewheel";
      }
      else
      {
        evt = "on"+arg["evt"];
      }
      if (ctrl)
        arg["obj"].attachEvent( evt , arg["fkt"]);
      else
        arg["obj"].detachEvent( evt , arg["fkt"]);
    }
    ie = true;
  }
  else
  {
  }
}
function addEvent(param)
{
  var cmds = prepareEventParameter(param)
  if (cmds !== false)
  {
    executeEventParameter(cmds,true);
  }
}
function removeEvent(param)
{
  var cmds = prepareEventParameter(param)
  if (cmds !== false)
  {
    executeEventParameter(cmds,false);
  }
}