Can someone tell me how come this dosent work?

/* To-Do-List plugin */
$r = sed_import('r','G','ALP');
$g = array ('a');
foreach($g as $x) $$x = $HTTP_GET_VARS[$x];

if ($a=="addlist")

{
sed_shield_protect();
$g = array ('nnotebook_id','nnotebook_userid', 'nnotebook_message');
foreach($g as $x) $$x = $HTTP_POST_VARS[$x];
$sql = sed_sql_query("INSERT INTO ".$cfg['plugin']['options']['dbprefix']."_notebook (notebook_id, notebook_userid, notebook_message) VALUES ('$nnotebook_id', '".$usr['id']."', '$nnotebook_message') ");
header("Location: plug.php?e=options");
}

if ($a=="deletelist")
{
$sql = sed_sql_query("DELETE FROM ".$cfg['plugin']['options']['dbprefix']."_notebook WHERE notebook_userid = '".$usr['id']."' AND notebook_id = '$id' ");
header("Location: plug.php?e=options");
}

if ($a=="updatelist")
{
$sql = sed_sql_query("DELETE FROM ".$cfg['plugin']['options']['dbprefix']."_notebook WHERE notebook_userid = '".$usr['id']."' AND notebook_id = '$id' ");
$g = array ('nnotebook_id','nnotebook_userid', 'nnotebook_message');
foreach($g as $x) $$x = $HTTP_POST_VARS[$x];
$sql = sed_sql_query("INSERT INTO ".$cfg['plugin']['options']['dbprefix']."_notebook (notebook_id, notebook_userid, notebook_message) VALUES ('$nnotebook_id', '".$usr['id']."', '$nnotebook_message') ");
header("Location: plug.php?e=options");
}

$notes .= "<p> ".$L['currenttodo']." <ul>";

$query= sed_sql_query("SELECT * FROM ".$cfg['plugin']['options']['dbprefix']."_notebook WHERE notebook_userid = '".$usr['id']."' ORDER by notebook_id DESC");
$notenum = sed_sql_numrows($query);
if ($notenum==0)
{
$notes .="".$L['nonotes']."";
}
while ($sql = sed_sql_fetcharray($query))
{
$notes .= "<li>" .sed_parse(sed_cc($sql['notebook_message']));

$notes .= " <a href=plug.php?e=options&a=deletelist&id=".$sql['notebook_id'];
$notes .= ">[".$L['xdelete']."]</a> ";
$notes .= " <a href=plug.php?e=options&r=updatelist&id=".$sql['notebook_id'];
$notes .= ">[".$L['edit']."]</a></li>";
}

$notes .= "</ul>";

$query = sed_sql_query("SELECT notebook_message FROM ".$cfg['plugin']['options']['dbprefix']."_notebook WHERE notebook_userid = '".$usr['id']."' AND notebook_id = '$id'");
$sql = sed_sql_fetcharray($query);

if ($r=="updatelist")
{
$notes .= "<p>".$L['updatetodo']."";
$notes .= "<form name=\"addentry\" action=\"plug.php?e=options&a=updatelist&id=$id\" method=\"post\">";
$notes .= "<br /><textarea name=\"nnotebook_message\" rows=\"2\" cols=\"30\">".$sql['notebook_message'];
$notes .= "</textarea><br />" .sed_build_bbcodes("addentry","nnotebook_message",$L['BBcodes']);
$notes .= " ".$cfg['separator']." <a href=\"plug.php?e=options\">Add New Note</a><br /><br /><input type=\"submit\" value=\"".$L['updatetodo']."\"></form></p>";
}

else
{
$notes .= "<p>".$L['addtodo']."";
$notes .= "<form name=\"addentry\" action=\"plug.php?e=options&a=addlist\" method=\"post\">";
$notes .= "<br /><textarea name=\"nnotebook_message\" rows=\"2\" cols=\"30\"></textarea>";
$notes .= "<br />" .sed_build_bbcodes("addentry","nnotebook_message",$L['BBcodes']);
$notes .= "<br /><br /><input type=\"submit\" value=\"".$L['addtodo']."\"></form></p>";
}

what doesn't work? are you getting an error?

What doesn't it do? What do you expect it to do? What, if any, errors are shown?

its a simple to do list its suppose to update the db or insert or display in the page

and are you getting an error? what happens when you run it? have you setup the data base and configured the connection script('s) for it?

when i use the script the page loads blank then when i go bak nothing has happened

Try this: http://www.codingforums.com/showthread.php?p=617060#post617060

And make sure to try looking in the page source in the browser for any error messages, some times they don't render depending on their placement in the HTML.