DatePicker call to setDate causes excess white space

DatePicker call to setDate causes excess white space

I initialize the datepicker below<div>
</div><div><div>$(document).ready(function() {</div><div>  $("#dateStart").datepicker();</div><div>  $("#dateEnd").datepicker();</div><div>}</div><div>
</div>
<div>If I then call</div><div>
</div><div><div>$("#dateStart").datepicker('setDate', 'today');</div><div>$("#dateEnd").datepicker('setDate', 'today');</div><div>
</div>
<div>before either of the date pickers have been shown the page scroll bar appears and appends white space to the page.  If I then trigger the datepicker to display this white space disappears.  If I first display the date picker and then call the setDate functions I never see the white space nor scroll bars.</div>
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</div><div>Anyone else ever seen this issue?</div><div>
</div><div>Nathan</div></div></div>