If the host doesn't support PHP, you might consider generating static pages from your scripts. If your using PHP as a templating system then this will be easy. You'll need to get to know three statements:
ob_start();// this starts the output buffer
// your script goes here
// make sure you use relative links
$output = ob_get_contents(); // get the output for the buffer
ob_end_clean();// clear and reset the buffer
// now just save $output to an HTML file
As for that under construction page, it will go away as soon as you create an index.html file. (Usually, haven't used geo in a long time.) Hope that helps?