If your not getting anythinng in the drop down box, try this.
You: //Changes are in RED
while($row = mysql_fetch_array($result)) {
$kinase = $row['kinase'];
$tracer_conc = $row['tracer_conc'];
$options.= "<option value='$id'>".$kinase;
// You do not have ID defined in $row..
}
echo "</select>"; <-- Why is this here?
?>
<select name="users" onchange="showUser(this.value)">
<option value="">Select a Kinase:</option>
<?=$options?> // Never write in shorthand. Confuses with XML
</select>
New:
$row = mysql_fetch_array($result);
$kinase = $row['kinase'];
$tracer_conc = $row['tracer_conc'];
$options = "<option value='".$row['id']."'>$kinase</option>";
?>
<select name="users" onchange="showUser(this.value)">
<option value="">Select a Kinase:</option>
<?php echo $options ?>
</select>
I changed while($row = mysql_fetch_array($result)) { to $row = mysql_fetch_array($result); because when you had it your way, that only queries in the curly brackets. The other way, you can pass variables thru out the page. If im wrong, sorry. This is what i always do. I hope this helps