filtering XML data in flash using a drop down menu.

I have created a flash movie to display data based on the following:

<surfforecast spot="10" name="Cromer" link="http://msw202.com/Cromer-Surf-Report/10/">

<today day="Today" swelldata="2FT@4SECS" windspeed="6MPH" winddir="NE" rating="0"/>

<tomorrow day="Tomorrow" swelldata="1FT@6SECS" windspeed="6MPH" winddir="NNW" rating="2"/>

<nextday day="FRIDAY" swelldata="3FT@4SECS" windspeed="20MPH" winddir="SSW" rating="3"/>

</surfforecast>

I am using actionscript to display the data in an SWF file which is all working fine.

I now need to find a way to filter the data based on the first line of the XML <surfforecast spot="10" name="Cromer" link="http://msw202.com/Cromer-Surf-Report/10/">

I would like to created a dropdown list menu from which the user can select a location (there could be more than 30 locations) and then have the relevent data displayed in my SWF movie.

I would also like to be able to remember a users choice for next time they visit the webpage.

Any advice as to the best way to do this is much appreciated.

Many Thanks