// Toggle audio
var togglePlay = function(audioId)
{
    var audio = document.getElementById(audioId);

    if (audio.paused === false)
    {
        audio.currentTime = 0;
    }
    else
    {
        audio.play();
    }
};

// Find all buttons
var buttons = document.getElementsByTagName('button');

// Set click event on all buttons
for(var i = 0; i < buttons.length; i++)
{
    buttons[i].onmousedown = function()
    {
        togglePlay(this.getAttribute('data-audio-id'));
    };
}