Rewrite question

Dear,
I am trying to solve this problem with apache ( 1.3.12) mod_write .

I would like to riderect reuqest from one old domain to a new one passing throug a splash page.
So I am using the following rules :
RewriteCond %{HTTP_HOST} test.olddomain.it
RewriteRule ^/(.*)$ http://test.newdomain.it/external/splash/splash.jhtml?"$1" [L,R=permanent]

But this does not work because parameters on the url are lost.
Also the main url is formed like :
http://test.olddomani.it/<somthing+parameters>
so I would like to redirect the requests to the splash page :
in a way like :
http://test.newdomain.it/splash.jhtml?"<something+parameters>"
Can anyone help me ?
Thank you in advance.