Dependent fields in search

Hi,

Thanks for the plugin.

We are using it, and it′s working very fine. But we need to create dependent fields in search box. It means, that when a City is selected, the items in Suburb select are only those related to the selected city. Now, if there are some cities and every city have some suburbs, all the suburbs appear in the select field in spite of one city is selected. How it′s possible to do this with easy property listings?

Thanks.