Code to make download link appear after 30 seconds?

I'm trying to find a code that will make the download link appear after 30 seconds. I'm thinking this is probably pretty easy to do, but I don't know how.

I'd also like it to countdown the seconds if possible. So it would say something like the following:

"Your download will be available in 30 seconds"

It would countdown from 30 to 0 and then the download link would appear. Does anybody know how to do this, or does anybody know of a website that'll show me how to do this?

Thanks

The information is available, all over the internet

Great response on StackOverflow and how to do it with jQuery available here

easy. javascript, start with the link hidden like <a id=link href="" style="display:none">link</a>

then have a javascript function that runs onload thats has a timer

Look up SetTimeOut()

then the syntax would be:

setTimeOut('showlink()',3000) <- the 3000 is miliseconds.

function showlink(){
document.getElementById('link').style.display='';
}