Dynamic map file, dynamic data item

[Baris YILMAZ]

Hi,

I am using Maplab, with php/mapscript and rosa applet.  I have a map file which has some layers. The layers data is read from a postgis db extention. I have some linestrings which are read from a database with,    
DATA "geometry from schnittverlauf"
and viewed in the rosa applet.

What I want to do is, I want to dynamically filter the geometries read from the database as per the users input, since I don't want every linestring to be drawn. 
Can anyone tell me how I can do that? 
Thank you all

Baris
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