FlashAir + jQuery + ajax + IE

$.ajax( {
    type: "GET",
    url: "/command.cgi?op=190&CTRL=0x1f&DATA=" + value,
    cache: true,
    dataType: "json",
    timeout: 3000,
    beforeSend: function( jqXHR, settings ) {
        jqXHR.setRequestHeader( "If-Modified-Since", "Thu, 01 Jan 1970 00:00:00 GMT" );
    }
} ).done( function( data, textStatus, jqXHR ) {
    if ( data.STATUS != "OK" ) {
        alert( data.STATUS );
    }
} ).fail( function( jqXHR, textStatus, errorThrown ) {
    alert( textStatus + "\n" + errorThrown );
} );