#38 Error on clicking the sites and users as root

[Anonymous]

On click at sites and users on the root menu IE6 points
to the following error
The XML Page cannot be viewed
(...)
The character "<" van not be used in an attribute value
if Stylesheet XSL is going to be used.
(...)

in sitesandusers.php Line 782:
<input type="button" value="< Add"
onclick="mainSubmit('add')" /><br />

Firefox 1.06 prompts to download the file instead of
displaying the contents.