It's nowhere near complete but Here is the code of the form im working on so far and i need the city state and zip to pop up in a new window and be filled in and then populate the original form with that data:

<form id="mlsorderentry" name="mlsorderentry" method="post" action="processorder.php">
<table width="100%" border="0" cellspacing="0" cellpadding="0" summary="Order Entry Form">
<caption>
<br />
<span class="maincontent_header_text">Order Entry Form </span>
<br />
</caption>
<tr>
<td class="Entryformtext">Street Name :</td>
<td class="Entryformformfields"><input name="GS_ADDRESS.1" type="text" id="GS_ADDRESS.1" value="<?php echo $_POST['GS_ADDRESS.1']; ?>" /></td>
</tr>
<tr>
<td class="Entryformtext">City / State / Zip :</td>
<td class="Entryformformfields"><input name="GS_ADDRESS.2" type="text" id="GS_ADDRESS.2" />
</tr>
<tr>
<td class="Entryformtext">Sale Price :</td>
<td class="Entryformformfields"><input name="GS_SALE_PRICE.1" type="text" id="GS_SALE_PRICE.1" /></td>
</tr>
<tr>
<td class="Entryformtext">Sale Price/ Gross Liv Area :</td>
<td class= "Entryformformfields"><input type="text" name="input"gs_sale_price.2"" id="input"""></td>
</tr>
<tr>
<td class="Entryformtext">Data Source(s)</td>
<td><input name="GS_DATA_SOURCE.1" type="text" class="Entryformformfields" id="GS_DATA_SOURCE.1" /></td>
</tr>
<tr>
<td class="Entryformtext">Verifiication Sources :</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">VALUE ADJUSTMENTS :</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">Sale or Financing Concesssions</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td class="Entryformtext">&nbsp;</td>
<td>&nbsp;</td>
</tr>
</table>
</form>