[Javascript] add a new entry in a drop down menu

[noel.jean-baptiste at courrier.uqam.ca]

Is it possible to have an entry field in an drop down menu ?
For example in this code :

<SELECT SIZE="1" name="cours">
<OPTION>un</OPTION>
<OPTION>deux</OPTION>
<OPTION value =""></OPTION>
</select>

For the attribute value of option, can we entry a value from the html 
page ?
If isn't possible, what are the others solutions ?
Thank you