I have searched and read as much as I can find about this subject but nothing really gives a clear answer.

Im trying to setup a more advanced search, where visitors can narrow down the search by using different drop down boxes. These boxes are all related to different custom fields.

I have fields with several options such as: colour.. you can select white, black, blue etc..

I also have dropdown box for category, which would restrict the search to only a certain category. This works fine.

However when using any other extra option / fields to narrow down search it does not work.

For example, If I select blue in the drop down box for colour and do a search. The search result is not restricted to any link with the blue option selected. The search result shows all links no matter what is selected in this colour field..

If I even try a search with the no keyword at all, ie leave the keyword box empty. and just try and search by the fields provided. For example select blue and press submit... it comes up with nothing. Even if there is for sure links with blue selected.

Why does it work ok with category but not with any other custom field. I want to make it possible to narrow down searches and even do searches without keywords but just selection on custom fields.

How can this be done?

Thanks