Another newbie checkbox question

I have a database with a listing called "schools" (table 1) and a list of categories called "highlights" to be assigned to each school (table 2). Each school in the list can have multiple highlights, so I am using checkboxes on my editing form. The checkboxes are generated by looping through the "highlights" table. <CODE SAMPLE> <?php // Fetch the list of highlights from the database. while ($numrows = mysql_fetch_array($highlight_select)) { echo "<input type=\"checkbox\" name=\"highlight_submit[]\" value=\"".$numrows[highlight]."\">&nbsp;".$numrows[highlight]."<br>\n"; } ?> </CODE SAMPLE> I plan to store the contents of the checkboxes in an array, and them implode it into a single field/column called "highlights" in the "schools" table separated by commas. <CODE SAMPLE> $highlights.schools = implode(", ", $highlight_submit); </CODE SAMPLE> My problem? When a user accesses the form, I want them to be able to see if any highlights are already checked off. I query the highlights field in the schools table and explode it into an array. <CODE SAMPLE> $highlight_checked = explode(", ",$schoolinfo[highlights]); </CODE SAMPLE> I want to test the checkboxes against the contents of the exploded array, but I can't seem to figure out the logic. When I've gotten the boxes to be checked, I get doubles or triples of the same checkbox. Should I write a separate function to handle the test, or can I nest a loop in the WHILE loop that generates the checkboxes in the first place? This is a simple problem (I think), but it has me very confused! TIA, Rob -- Rob Costain rcostain@sympatico.ca - 514.808.3639 Quebec English Schools Network RÉCIT - http://www.qesnrecit.qc.ca