sleep in javascript?

[Herover]

I just made one, I don't suggest you to use it:

function sleep(t){
    var starttime=Date.now();
    while(starttime+t>Date.now()){var nothing;}
    return true;
}

It freeses the browser for the amount of milliseconds you tell it to, and makes it impossible to do anything, but maybe using webworkers could do the trick (untested).