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Need to make a drop down selection enable a REQUIRED FIELD

js1138 asked
Last Modified: 2012-05-11
I have a drop down box with 5 options:
<select size="1" name="_fnm_hmo_plan1">
        <option selected value="Please Select">Please Select</option>
        <option value="na">N/A</option>
        <option value="HMO">HMO</option>
        <option value="Open Access HMO">Open Access HMO</option>
        <option value="QPOS">QPOS</option>
        <option value="Aetna Choice POS">Aetna Choice POS</option>

I also have 3 input text fields:
<td width="48%" valign="top" align="left" style="border-style:none; border-width:medium; "><b>Group Number(s):</b>
        <input type="text" name="_fnm_HMOcontrol" size="40" ></td>
        <td width="48%" valign="top" align="left" style="border-style:none; border-width:medium; "><b>AQC Quote ID(s) and Quote Option Name(s):</b><input type="text" name="_fnm_HMO_AQC_quote" size="40" ></td>
        <td width="48%" valign="top" align="left" style="border-style:none; border-width:medium; "><b>Guide Quote ID(s):</b>
        <input type="text" name="_fnm_HMO_GUIDE_quote" size="40" ></td>

The desired result:
If anything other than "N/A" is selected from the drop down. At least one or all of the 3 fields needs to be filled in. In which case they become required.

Any thoughts or samples are much appreciated.

Again the user may not need to fill out all three fields but at least one needs to be required in order to submit or
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