Ho risolto così :

<html>
<head>
<title>Ciao</title>
</head>
<body>
<script type="text/javascript">
...
output.innerHTML += "<form name=form1 method=post action=ok.php><table border=0><tr><td>variabile1:</td><td align=left><input name=variabile1 type=text value=" + variabile1 + "></td></tr><tr><td>variabile2:</td><td align=left><input name=variabile2 type=text value=" + variabile2 + "></td></tr><tr><td>Text:</td><td align=left><input name=new_desc type=text size=60></td><tr><td></td><td align=left><INPUT TYPE='HIDDEN' name='action1' value='get'><input type=submit name=Submit value=Submit></td></tr></table></form>";

...
</script>
<hr>
<div id="output" style="font-family:verdana,tahoma;font-size:small;"></div>



</body>

</body>
</html>



Cosa ne pensate?