Pre-selecting from Spry Data Select Box

Hi
I am new here so sorry if this is in the wrong section/format
I am using Two Spry XML Datasets to populate 2 dropdown boxes with vehicle makes and the connected model names (there are other fields but for the sake of clarity I will only show these 2). The XML is dynamically generated by PHP/MySQL and works great for initially creating records. The problem I have is when I want to edit my record and so pre-select the data in the dropdown select box. The first box is easy and works fine but the second box only updates when the first is updated using the 'onchange' and I cannot get it to update on load. I can get it to update 'onclick' or other events but I need it to update the second box when the page loads. Any ideas? I am sure there is a simple solution staring me in the face, but I just can't see it
My code is listed below. I have cut out all the unnecessary code to make it more clear (hopefully)
<script src="../../SpryAssets/xpath.js" type="text/javascript"></script>
<script src="../../SpryAssets/SpryData.js" type="text/javascript"></script>
<script type="text/javascript">
var dsmakes = new Spry.Data.XMLDataSet("xmlgenmake.php", "vehicle/makes");
var dsmodel = new Spry.Data.XMLDataSet("xmlgenmodel.php?xmlmake={dsmakes::make}", "makes/models/model");
</script>
</head>
<body>
<form action="<?php echo $editFormAction; ?>" method="post" name="form1" id="form1">
<span spry:region="dsmakes" id="makeSelector">
<select spry:repeatchildren="dsmakes" id="makeSelect" name="make" onchange="document.forms[0].modelSelect.disabled = true; dsmakes.setCurrentRowNumber(this.selectedIndex);">
<option spry:if="'{dsmakes::make}' == '<?php echo $row_Recordset1['make']; ?>'" value="{dsmakes::make}" selected="selected">{dsmakes::make}</option>
<option spry:if="'{dsmakes::make}' != '<?php echo $row_Recordset1['make']; ?>'" value="{dsmakes::make}">{dsmakes::make}</option>
</select>
</span><span spry:region="dsmodel" id="modelSelector">
<select spry:repeatchildren="dsmodel" id="modelSelect" name="model">
<option spry:if="'{dsmodel::model}' == '<?php echo $row_Recordset1['model']; ?>'" value="{dsmodel::model}" selected="selected">{dsmodel::model}</option>
<option spry:if="'{dsmodel::model}' != '<?php echo $row_Recordset1['model']; ?>'" value="{dsmodel::model}">{dsmodel::model}</option>
</select>
</span>
</body>
</html>

Sorry for not being clear -
The first Spry Select box populates with the Vehicle Makes and selects the stored make from the DB. The second box is supposed to populate with the corresponding Vehicle Models (corresponding to the Vehicle Make in box one) but it initially only populates with the first makes data (not the selected one) if I add:    onfocus="dsmakes.setCurrentRowNumber(this.selectedIndex);     to the first box it works as it should as soon as it receives focus and the second box updates and selects the correct model.
I have tried adding
Spry.Utils.addLoadListener(InitPage);
     function InitPage() {
       dsmakes.setCurrentRowNumber(makeSelect.selectedIndex);
but I cannot get the second box to update without clicking on the first
It seems there should be s simple solution to this but I cannot see it.

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