trouble printing off array derived from MySQL db

I want to select a single record from a MySQL database, stick it in an array and then print off the keys in one table column and the values inside a textbox for editing in a second contiguous column.

Only problem is the resultant array ($rows) has interpolated additional numerically indexed key-value pairs doubling the number of fields. What is going on here? It's doing my head in.

============================================
$query = "SELECT * FROM $table
WHERE student_id = $student_id";

$result = mysql_query($query);
$rows = mysql_fetch_array($result);

reset($rows);
//start table and print headings
echo("<table><tr><th>Field</th><th>Value</th></tr>");
// print remaining values
while (list($col1,$col2) = each($rows)) {
echo ("<tr><th>$col1</th><td><input type=text name=$col1 value=$col2 /></td></tr>");
}
// end table
echo "</table>";
============================================

This above code results in the following:
Field Value
0 135
student_id 135
1 2
lunches 2
2 2
dinners 2

I don't want the numerically indexed keys (0, 1 and 2) or their values, only those with the db table field names and their values.