function addEvent( obj, type, fn ) {
    if( obj.addEventListener )
        obj.addEventListener( type, fn, false );
    else 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 ] );
    }
}