function sound(state) {

if(state=="0") {
pause(); // pause the video 
set_cookie('sound', '1', 30); // sets cookie value to 1
document.getElementById('soundimg').style.backgroundImage="url(/images/sound_off.jpg)"; // changes image to sound off
}

if(state=="1") {
play(); // pause the video 
set_cookie('sound', '0', 30); // sets cookie value to 1
document.getElementById('soundimg').style.backgroundImage="url(/images/sound.jpg)"; // changes image to sound on
}

}