Checkboxes, i have no clue...

[eluser]Jbeasley6651[/eluser]
I have never had to do this before so i have no clue.

I am building a real estate property search and all is well except for the fact that there is a need to search by multiple cities using check boxes. So I am outputting all the cities and populating a page with about 25 cities all with checkboxes next to them.

THE PROBLEM : I do not know how to associate the multiple selected/checked boxes into my search query.

Can someone please write a very rough example or point me to an open source ci project that uses this?

Thanks,

Jbeasley