How do I create a wildcard search?

[podsnap]

I need to create a search page that give all results if nothing is input into the field.

Ultimately I want to have several fields on the page and the user will be able to enter as much or as little into the fields.

So while the first field it likely to be a keyword search I might also have a field for say, 'city' and if nothing is chosen then it will give results for all cities but, obviously, if London is chosen then it will give results for just London.

Any ideas how I go about this? Or can you point me to a good tutorial?

Thanks.

PS: I'm not, by any means, a code warrior, so speak slowly [img src=\"style_emoticons/[#EMO_DIR#]/wink.gif\" style=\"vertical-align:middle\" emoid=\":wink:\" border=\"0\" alt=\"wink.gif\" /]