[TYPO3] Unable to parse url: tslib/class.tslib_content.php on line 4803

[greg at grit.net.au]

Greetings list users.

I am experiencing a problem with Typo3 version 3.6.2
As far as I know nothing has changed in the install.. the server cfg could have
been altered (since I am leasing a server account for this install of T3).

When I am editing content using the frontend I receive the following warnings:

Warning: parse_url(http://javascript:window.print()): Unable to parse url in
/home/mysite/public_html/tslib/class.tslib_content.php on line 4803

Warning: parse_url(http://javascript:window.print()/): Unable to parse url in
/home/mysite/public_html/tslib/class.tslib_content.php on line 4803

With “mysite” replaced with the actual user account on the server.
The text appears at the top of all pages in the site whilst an admin user is
logged in.

Can I correct this problem and remove the warning?

Thank you in advance to all who can assist.

Regards,
Greg