Random interval number

I modified this countdown script to actually count up.

Now it changes the innerHTML of the div "container" every 300 ms.

How can i change that 300ms to be a random number between 300 and 2000?

Thanks so much for all your help :P

Greetz, Camillo

var time = 1; //How long (in seconds) to countdown
开发者_如何学编程function countDown(){
time++;

gett("container").innerHTML = time;
if(time == 0){
window.location = page;
}
}
function gett(id){
if(document.getElementById) return document.getElementById(id);
if(document.all) return document.all.id;
if(document.layers) return document.layers.id;
if(window.opera) return window.opera.id;
}
function init(){
if(gett('container')){
setInterval(countDown, 300); // here instead of 300 a random number between 300 and 2000
gett("container").innerHTML = time;
}
else{
setTimeout(init, 50);
}
}

Replace with: ( 300+Math.floor(Math.random() * 1700) )

EDIT AFTER YOUR COMMENT:

function countDown(){
  gett("container").innerHTML = ++time;
  if(time == 0){
      window.location = page;
  }
  else
      setTimeout(countDown,( 300+Math.floor(Math.random() * 1700) ));
}

And you call it by using:

setTimeout(countDown,( 300+Math.floor(Math.random() * 1700) ))

or simply countDown()

Oh, and you should know that accepting answers will increase your chances of getting "more of them" :)