thanks, I added the last line to this section and it works perfectly. Below I put a few notes for those who are not programmers (which I am not. I figure if I had the problem the next person to need this will find the same problems. Sorry if it's obvious to the highly trained among us.)
$_CONF['admin_html'] = array (
'p' => array('class' => 1, 'id' => 1, 'align' => 1),
'div' => array('class' => 1, 'id' => 1),
'span' => array('class' => 1, 'id' => 1),
'table' => array('class' => 1, 'id' => 1, 'width' => 1, 'border' => 1,
'cellspacing' => 1, 'cellpadding' => 1),
'tr' => array('class' => 1, 'id' => 1, 'align' => 1, 'valign' => 1),
'th' => array('class' => 1, 'id' => 1, 'align' => 1, 'valign' => 1,
'colspan' => 1, 'rowspan' => 1),
'td' => array('class' => 1, 'id' => 1, 'align' => 1, 'valign' => 1,
'colspan' => 1, 'rowspan' => 1),
'form' => array ('action' => 1, 'method' => 1, 'target' => 1, 'input ' => 1, 'type' => 1, 'name' => 1, 'value' => 1, 'image' => 1, 'src' => 1, 'border' => 1, 'alt' => 1)
);
1. Be sure everything that will appear between the form tags will be in included in the array - including image, even though it may be accounted for elsewhere..
2. Make sure the last line does not have a comma after it.
3. When you paste the paypal code do it in the text editor not the html window. (although that kind of works and someone could probably figure out how to allow it, I just don't know enough to say how.)
Thanks again for your help, and I hope this helps the next person with the same problem get a quick answer.