PHP/HTML how do you creat a drop down list that open another drop down list? -

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all, writting php script runs part of joomla site. have table
event
day;
time;
races; (is array of race id's)
....

here race table
race
id;
name;
...

on site want have drop down list of table event. when click on event in list, want open second drop down list on page of possible races (using values of event.races query). idea on how first drop down selected can create second on page?

check out son of suckerfish menu system. you'll need creative css accomplish, these guys have done , it's pretty easy implement.


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