function startIndicator(indicator, opacity) {
    if (!indicator)
        return;

    if (opacity == undefined)
        opacity = 0.5;

    $(indicator).animate({
        opacity: opacity
        //"-moz-transform" : 'rotate(90deg)', "-webkit-transform" : 'rotate(90deg)'
    }, 1000, "linear", function(){
        startIndicator(indicator, opacity < 1 ? 1 : 0.5)});
}