Simple Counter

i need a 5 second counter to start when the page loads. basically the usage is I want people to click a link, and if the page has been loaded for more than 5 seconds, do thisFunction().. if not, do nothing.

so basically

<script type="text/javascript">

window.onload --> start the counter
// when the counter hits 5 seconds, set var done = true;

function thisFunction() {
if (done = true) { proceed with function)
else {do nothing}
}
</script>

...

<a href="linkyPoo.html" onclick="checkCounter">OO oOO, click me!</a>