Sound playback loop function 1st draft

sound_loop.js

var sounds = [["How are you", "hi.mp3"], ["Who is this", "who.mp3"], ["How was school", "how.mp3"], ["What is this","what.mp3"], ["Who is this", "who.mp3"], ["1 + 2", "math.mp3"]],
    presets = ["Who is this", "What is this"];

function loop(){ 
        setTimeout(function(){
                var sound = sounds.splice( 0, 1 ),
                    clearDivContents = function( klasses ){
                            console.log( klasses );
                            for( var i=0; i < klasses.length; i+=1 ){
                                    $( klasses[i] ).children().detach();
                            }       
                    };      

                if( sound.length > 0 ){
                        $("#container").text( sound[0][0] + "?" );
                        console.log( "Playing " + sound[0][1] );

                        if ( sound[0][0] === presets[0] ){
                                console.log( "Display random image of person" );
                                $("#person").append( "<img src='images/person/person.jpeg'></img>" );
                                clearDivContents( ["#object"] );
                        }else if ( sound[0][0] === presets[1] ){
                                console.log( "Display random image of object" );
                                $("#object").append( "<img src='images/object/object.jpeg'></img>" );
                                clearDivContents( ["#person"] );
                        }else{
                                clearDivContents( ["#person", "#object"] );
                        }
                        document.title =  "Sound Loop: " + sound[0][0];
                        $("#question_item > ul").append( "<li>" + sound[0][0] + "?" + "</li>" );

                        loop();
                }else{
                        document.title =  "Sound Loop: End of Session.";
                        $("#container").text( "End of Session." );
                        clearDivContents( ["#person", "#object"] );
                }
        }, 5000);
} 

loop();