I am a beginner and i want to know if it is possible to force the input of a text area with the content of a variable ? And in a large way manipulate those text zones with instructions like text.focus...or else. Thank you for your help.
To put a text into a textarea from within PHP:
<? echo '<textarea name=bla>'; echo $variable; echo '</textarea>'; ?>
As for things like text.focus, have a look at a javascript website.
supposing your text area named t1 is inside a form named f1 then to put focus you will need to write a javascript which will be something like
document.f1.t1.focus()// will put focus on t1 when called
have a look at javascript sites for more cheers!