function windowloadit() {
    var cookie    = new HTTP.Cookies;
    var timezone  = cookie.read('timezone');
    if (! timezone) {
        var timezoneOffset = -(new Date().getTimezoneOffset());
        //alert(timezoneOffset);
        cookie.write('timezone',timezoneOffset,'+1y');
    }
}

function addEvent( obj, type, fn ) {
  if ( obj.attachEvent ) {
    obj['e'+type+fn] = fn;
    obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
    obj.attachEvent( 'on'+type, obj[type+fn] );
  } else
    obj.addEventListener( type, fn, false );
}

addEvent( window, 'load', windowloadit );