see the spry documentation here:
help.html?content=WSDBFCA944-4E99-421a-9328-8533440AA7F3.html
In the navigation, the link for "Set the default open panel" says:
You can set a certain panel to be open when the page containing the Accordion widgets loads in a browser.Set the defaultPanel option in the constructor as follows:
<script type="text/javascript">
var acc8 = new Spry.Widget.Accordion("Accordion8", { defaultPanel: 2 });
</script>
Note: The accordion panels use a zero-based counting system, so setting the value to 2 opens the third panel.
on your page, the code to initialize the accordion is:
<script type="text/javascript">
var Accordion1 = new Spry.Widget.Accordion("Accordion1");
</script>
add ", { defaultPanel: 3 }" to that to force the forth tab to be the default open tab:
<script type="text/javascript">
var Accordion1 = new Spry.Widget.Accordion("Accordion1", { defaultPanel: 3 });
</script>
