hi Kitty Kate,
i myself work for four years now as a tech support, ive seen clueless noobs pull stuff of you wouldnt beleive all because they followed some simple manual that guided them.
im not questioning your nor fridays rep here, all i said to him/her was that this particulair gallery showed me weird behaviour, enough to get the account deleted...
like i stated before i will say it again, i got 150 submits per day, not one of them ever showed me this behaviour....
BTW you do realise that it is freaking easy if you got htaccess and cgi-bin access to add html to the gallery...i believe germisia from brownie tgp script actually has the source code for it on their site to use as a banner addition for free hosting, which i have got runnnig on fhgheaven btyw where i host galleries for several peoples....
so in short, i spent a lot of time reviewing galleries, and cant have this shit happening to me... simplest way to get rid off it is get rid of the account that done it to ya
any tgp webmaster would do the same imho