$(".play").delegate(this,'click', function(){
    var value = $(this).attr("value")
    $("#playing-icon").remove();
    $("td."+value).append("<img id='playing-icon' src='style/control_play.png' align='top' style='position:absolute; left:3px; top:3px;'>");
    $("#song").attr("src", "music/"+value+".mp3");
    $('#player').load();
});