Thank you very much for your forum. I have found an answer to my problem of installing php_gd.dll for images.
When you want to instal Graphic Drawing Library, you must:
Make:
1)in \WINDOWS\php.ini-> default_mimetype=;"text/html" and
extension=php_gd.dll delete ;
2)put in c:\PHP directory
php_gd.dll, that was the part of this distributive set of PHP4.
Now I have another problem with TrueTypeFonts.
The subroutine imagettftext() gives an error,
when I put the path :"c/WINDOWS/FONTS/times.ttf".
Thank you. Veronique