[support] How to disable a wrong block when the site doesn't work

[Albert Cuesta]

Hi

Following a suggestion from a developer, I just added a PHP block to
my site's default theme, and now the site cannot be accessed

Fatal error: Call to undefined function: stock_do_quote() in
/home/canalpda/public_html/includes/common.inc(1342) : eval()'d code
on line 2

I need to disable that new block so everything works again. How can I
access the site admin, probably using another theme or no theme at all
so the bad block is disabled?

I'm using Drupal 5.1

Thanks for any assistance.

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Albert