On initially downloading this the code does not seem to run at all. It appears that one possible issue is a minor typo in 'index.html'.
It looks like this:
<td class="regname">D</td><td class=reg" rel="d"></td>
There should be a " before reg.
Additionally the presentation of an non-existent '.gb' filename seems to cause the emulator some trouble. In addition to not working at all, it seems to cause all three tabs to show up in a vertical column (with the latter two not getting a header) rather than showing only the selected tab in the designated position. It appears to be a specific problem resulting from a wrong hardcoded value at page load. If you change the input field later to a non-existent file then it simply doesn't load that and retains the previous rom.

On initially downloading this the code does not seem to run at all. It appears that one possible issue is a minor typo in 'index.html'.
It looks like this:
There should be a " before reg.
Additionally the presentation of an non-existent '.gb' filename seems to cause the emulator some trouble. In addition to not working at all, it seems to cause all three tabs to show up in a vertical column (with the latter two not getting a header) rather than showing only the selected tab in the designated position. It appears to be a specific problem resulting from a wrong hardcoded value at page load. If you change the input field later to a non-existent file then it simply doesn't load that and retains the previous rom.