I have a web page in which I am trying to refresh a iFrame. I'm trying to do it with something like a <input /> button and javascript. I can't seem to get the iFrame to reload without clearing the cache. Getting PHP to clear the cache would be even better.

EDIT-UPDATE

Here's the working implementation inline.

    <input type=button  onClick=javascript: var iFrame = document.getElementById('compilePreview'); iFrame.src = '<? echo ($myFile); ?>?random=' + (new Date()).getTime() + Math.floor(Math.random() * 1000000); value=Reload Preview />

    <iframe id=compilePreview src=<? echo ($myFile); ?> width=940></iframe>

And of coarse the onload was soon to follow, eliminating the need for the button.

    <script>

    window.onload=refreshIframe;

    function refreshIframe(){

    var iFrame = document.getElementById('compilePreview');

    iFrame.src = '<? echo ($myFile); ?>?random=' + (new Date()).getTime() + Math.floor(Math.random() * 1000000);

    }

    </script>