var lastPlayedId = "";
function preview(el,source)
{
    //stop sound
    soundManager.stopAll();
    
    if (document.getElementById(el).name == 'play' )
    { 
        //play sound
        soundManager.createSound(el,source);
        soundManager.setVolume(el,100);
        soundManager.play(el);
        document.getElementById(el).name = 'pause';
        document.getElementById(el).src = "http://media.supernova.com/images/buttons/pause.png" ;
    }
    else
    { 
        document.getElementById(el).name = 'play';
        document.getElementById(el).src = "http://media.supernova.com/images/buttons/play.png" ;
    }
    if (lastPlayedId != "" && lastPlayedId != el)
    { 
        document.getElementById(lastPlayedId).name = 'play';
        document.getElementById(lastPlayedId).src = "http://media.supernova.com/images/buttons/play.png" ;
    }
    lastPlayedId = el;   
    
}