forms - Inserting drop down value into MySQL table -

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i have site, people supposed able arrange meetings users within system. i'm having difficulties getting start , endtime form appear in mysql database, i'm using timestamp format saving values. me figuring out i'm going wrong?

<?php $page_title = "create event";      //check if form has been submitted     if (isset($_post['submitted'])) {      $errors = array(); //initialize error array      // check event name     if (empty($_post['event_name'])) {         $errors[] = 'you have not given event name.';      } else {         $en = trim($_post['event_name']);     }      // check event location     if (empty($_post['location'])) {         $errors[] = 'you have not determined meeting taking place.';      } else {         $l = trim($_post['location']); }      if (empty($_post['starttime'])) {         $errors[] = 'you have not determined when meeting starting.';      } else {         $s = trim($_post['starttime']); }     if (empty($_post['endtime'])) {         $errors[] = 'you have not determined when meeting ending.';      } else {         $e = trim($_post['endtime']); }      if (empty($errors)) { // if ok                  // create event in database                  // require_once                 ('../mysqli_connect.php'); // db connect                  // make query                 $host="mysql.itu.dk";                 $username="tklo";                 $password="cave57waits49";                 $db_name="project_cluster";                 $tbl_name="events";                  mysql_connect("$host", "$username", "$password") or die ("cannot connect");                 mysql_select_db("$db_name") or die ("cannot select database");                  $sql="insert $tbl_name (event_name, location, starttime, endtime)values('$en', '$l', '$s', '$e')";                 $result=mysql_query($sql);                  if($result){                 echo "succesfull";                 echo "<br>";                 echo "<a href='newevent.php'>back main page</a>";                 }                  else {                 echo "error";                 }                 mysql_close();                 }     else {     echo '<h2>error!</h2>                 <p class="error">the following error(s) occured:<br />';                 foreach ($errors $msg) { // print each error                 echo " - $msg<br />\n";                 }                 }                                }   ?>         <form action="newevent.php" method="post">         <p>name event: <input type="text" name="event_name" value="<?php if(isset($_post['event_name'])) echo $_post['event_name']; ?>" /></p>         <p>where meeting taking place: <input type="text" name="location" value="<?php if(isset($_post['location'])) echo $_post['location']; ?>" /></p>         <p>beginning of event <input type="text" name="starttime" value="<?php if(isset($_post['starttime'])) echo $_post['starttime']; ?>" /></p>         <p>end of event <input type="text" name="endtime" value="<?php if(isset($_post['endtime'])) echo $_post['endtime']; ?>" /></p>          <input type="submit" value="go" />         <input type="hidden" name="submitted" value="true" />         </form>


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