How can I include an .html file in the footer ?

[kh99]

You could create a plugin using the "global_setup_complete" hook and modify the $footer variable at that point (you'd need php code to read in the file, which I guess could get complicated if it includes styles or javascript) Of course you could just copy the HTML you want to the footer template, but I guess if that would work for you you'd have done it already.