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Using select multiple with php3

<? function DisplayThreads() { $result=mysql_query("select min(datestamp),topic,thread from forum group by thread order by topic") or die ("Can't Preform query 1"); echo"<SELECT NAME=\"threads[]\" SIZE=\"8\" MULTIPLE>\n"; while( $row = mysql_fetch_object($result)) echo"<OPTION VALUE=\"$row->thread\">$row->topic($row->thread)\n"; echo"</SELECT>\n"; } Function SetHeader() { echo" <!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\"> <HTML><HEAD> <TITLE>WebThreads powered by PHP3</TITLE> <STYLE> A {text-decoration: none;} INPUT {font-family: Geneva, Verdana, Helvetica, Arial;font- size: 10pt;} TEXTAREA {font-family: Geneva, Verdana, Helvetica, Arial;font- size: 10pt;width: 400px;} </STYLE> </HEAD> <BODY BACKGROUND=\"../images/bumps2.jpg\" link=\"#0000FF\" vlink= \"#000080\" bgcolor=\"#D1C7B8\" text=\"#000000\" alink=\"#FF0000\"> "; } switch($command) { case 1 : SetHeader(); echo "<BR><BR><BR><FORM NAME=\"Myform\" ACTION= \"admin.run\"><CENTER>"; echo"<H2>Choose a thread to delete</H2>"; DisplayThreads(); echo "<INPUT TYPE=\"hidden\" NAME=\"command\" VALUE=\"2\"> <INPUT TYPE=\"submit\" NAME=\"submit\" VALUE=\"Delete Thread(s) \"> </CENTER> </FORM>"; break; case 2 : SetHeader(); $ThreadNum=count($threads); for($i=0 ; $i < $ThreadNum ; $i++) echo"Deleting thread number $threads[$i]<BR>\n"; } ?>