html - always hiding a button after clicking on it using php and css -

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i have php code hide download button after clicking on 1 time changing id 0 1 .. after if time user signed in , removes button using simple css hide code.

here code :

<?php          $result = @mysql_query("select *  scode   updated= 1 , coden ='$username'"); if ($_post[downloadthefile]== "downloadthefile") { $upd_art = "update  scode  set downloaded='".$_post[t11] ."' id='$_session[userid]'";       mysql_query($upd_art) or die(mysql_error()); }  if($row['downloaded']==1) { echo "<style> .thedownloadbutton {display:none;} </style>"; }      ?> <form class="thedownloadbutton" method="get" action="<? echo '../download/'.$item_downloadlink .'.zip' ;  ?>"> <button type="submit" name="downloadthefile" value="downloadthefile">download </button> <input name="t11"  type="hidden" size="2" value="1"> </form>

(just clarifying: updated =1 field that'll open download page.. if updated =1 there download page )

i don't know why doesn't work .. can me please , till me part wrong part ? know it's bad way hide element using css , there suggestion ?

$_post[downloadthefile] should $_post['downloadthefile']

if($row['downloaded']!=1) { echo '<button type="submit" name="downloadthefile" value="downloadthefile">download </button>'; }

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