<?php
    function cacheURL($url, $nodeID = false, $skipExisting = false)
    {
        $fileName = "http://$hostname$dir$url";
        $content = @file_get_contents($fileName);
        $this->storeCachedFile($file, $content);
    }

    function storeCachedFile($file, $content)
    {
        $fp = fopen($tmpFileName, 'w');
        if ($fp) {
            fwrite($fp, $content);
            fclose($fp);
            rename($tmpFileName, $file);
        }
    }

Set up RewriteRules:
RewriteEngine on

RewriteCond   /dat/ez.no/static/index.html -f
RewriteRule   ^/$     /static/index.html [L]

RewriteCond   %{REQUEST_METHOD}       !^POST$
RewriteCond   /dat/ez.no/static$1/index.html -f
RewriteRule   ^(.*)$  /static$1/index.html [L]