selecting rows not within another table

[Chris N]

I have 2 tables Stores and Store_Projects that im trying to pull all
stores not in certian projects but belong to a customer. Heres the
design of each

CREATE TABLE `Stores` (
`storeID` int(10) unsigned NOT NULL auto_increment,
`storeMetro` int(11) NOT NULL default '0',
`storeManager` int(10) unsigned NOT NULL default '0',
`storeState` int(10) unsigned NOT NULL default '0',
`storeAddress` varchar(100) default NULL,
`storeCity` varchar(50) default NULL,
`storeZipcode` varchar(20) default NULL,
`storePhone` varchar(20) default NULL,
`projectStatus` varchar(20) default NULL,
`storeSupervisorName` varchar(100) default NULL,
`storeSupervisorPhone` varchar(20) default NULL,
`storeSupervisorEmail` varchar(255) default NULL,
`storeOtherContactName` varchar(100) default NULL,
`storeOtherContactPhone` varchar(20) default NULL,
`storeOtherContactEmail` varchar(255) default NULL,
`storeNumber` varchar(50) default NULL,
PRIMARY KEY (`storeID`),
UNIQUE KEY `storeID` (`storeID`),
KEY `storeMetro` (`storeMetro`)
)

CREATE TABLE `Store_Projects` (
`projectID` int(6) unsigned zerofill NOT NULL default '000000',
`storeID` int(11) NOT NULL default '0',
`billRate` varchar(10) NOT NULL default '0.0',
`associatePayRate` varchar(10) NOT NULL default '',
`repsNeeded` smallint(6) default NULL,
`storeServiceDateDay` smallint(2) unsigned default NULL,
`storeServiceDateMonth` smallint(2) unsigned default NULL,
`storeServiceDateYear` int(4) default NULL,
`receivedPayment` enum('Y','N') NOT NULL default 'N',
`invoiceNumber` varchar(25) default NULL,
`invoiceDate` date default NULL,
PRIMARY KEY (`projectID`,`storeID`)
)

I had designed the query like this

SELECT st.*, s.stateInitials, m.metroName, sta.stateInitials AS
metroState
FROM Stores AS st
LEFT OUTER JOIN CustomerUsers AS cu
ON cu.userID = st.storeManager
INNER JOIN States AS s
ON st.storeState = s.stateID
INNER JOIN MetroAreas AS m
ON st.storeMetro = m.metroID
INNER JOIN States AS sta
ON m.stateID = sta.stateID
INNER JOIN Store_Projects AS sp
ON sp.storeID = st.storeID
WHERE st.customerID = 4
AND sp.projectID != 000002

But of course thats not going to work if the store is not in the
Store_Projects table which it wouldnt be if its not in a specific
project. So I need a way to pull all Stores with a specific customerID
but is NOT in the Store_Projects with a specific projectID.

Can anyone explain how this should be done within the query? I could
do it by creating an array and then processing out all the stores but
I would much rather let MySQL do the work for figuring this out. Any
help would be greately appreciated.