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Using select multiple with php3

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"; 
} 
?>