PHP $_POST checkboxes

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HTML

PHP

forms

Hi,
I've been adding to an existing code which I have the task of adding checkboxes to each row fetched from MySQL database. The problem is that $_POST is returning a null when I tell it to fetch checked boxes.

Here's the checkbox creation loop:

<pre lang="PHP">
      $RowCt = 0; //Row Counter
                while($Row = mysql_fetch_assoc($Result))
                {
                   
                    $k = $RowCt-1;
                    $Table.= "<td><input id=\"chkbx".$RowCt."\" onclick=\"bindCheckbox(".$RowCt.", ".$idValues[$k].")\" type=\"checkbox\" name='chkbx[]' value=".$k.">";

                    //Loop thru each field
                    foreach($Row as $field => $value)
                    {

                        $Table.= "<td nowrap=\"nowrap\">$value</td>";

                    }
                    $Table.= "</tr>";
                }

and the code where I want to get the checked values:

$doctorIds = $_POST['chkbx'];
		//echo $doctorname;
		//$q=select("SELECT * FROM `doctor` WHERE name = '$doctorname'");
		//$doctorname=$q[0]['id'];
		//echo $doctorname;	
		if (isset($doctorIds)||is_array($doctorIds)) {	
		foreach ($doctorIds as $key => $i){
		$b=execute_sql("INSERT INTO `doctorseller`(`doctorid`, `sellerid`) VALUES ('$i','$sellerid')");
		}

I have another form element which i get using the same $_POST method but this is giving me nulls. I would appreciate any suggestions