var milisec=0
var seconds=30

document.getElementById('out').innerHTML = 30;
function display(){
if (milisec>=9){
milisec=0
 seconds-=1
}
else
milisec+=1
document.getElementById('out').innerHTML = seconds;

if(seconds == 1) document.location.href=document.location+"?code=true";
if(seconds > 1)  setTimeout("display()",100);
}
display();