Javascript sleep function

function sleepFor( sleepDuration ){
    //alert();
    var now = new Date().getTime();
    while(new Date().getTime() < now + sleepDuration){ /* do nothing */ }
}

sleepFor(2000);

Source: http://stackoverflow.com/questions/951021/what-do-i-do-if-i-want-a-javascript-version-of-sleep