How can i convert this code into an acceptable codeigniter code:

mysql_select_db($database_connection_ched, $connection_ched);
$query_Institutions = "SELECT * FROM tb_institutional_profile ORDER BY tb_institutional_profile.institution_name ASC";
$Institutions = mysql_query($query_Institutions, $connection_ched) or die(mysql_error());
$row_Institutions = mysql_fetch_assoc($Institutions);
$totalRows_Institutions = mysql_num_rows($Institutions);

<td width="192"><select name="institution_id">
<?php 
do { 
<option value="<?php echo $row_Institutions['institution_id']?>" ><?php echo $row_Institutions['institution_name']?></option>
<?php
} while ($row_Institutions = mysql_fetch_assoc($Institutions));
?>
</select></td>