GWT and data visualization

Is it normal that using the query callback mechanism as outlined
here :
http://code.google.com/docreader/#p=gwt-google-apis&s=gwt-google-apis&t=VisualizationGettingStarted

Would create a new script tag (see below) every time I re-load the
data with a button click for example :

<script type="text/javascript" src="http://spreadsheets.google.com/tq?
key=pWiorx-0l9mwIuwX5CbEALA&amp;range=A1:B12&amp;gid=0&amp;headers=-1&amp;tqx=reqId
%3A1"></script>
<script type="text/javascript" src="http://spreadsheets.google.com/tq?
key=pWiorx-0l9mwIuwX5CbEALA&amp;range=A1:B12&amp;gid=0&amp;headers=-1&amp;tqx=reqId
%3A2"></script>

Every time I refresh the dataset with a new query callback call. I get
a new script tag added to my header of the html... is this normal?

thanks in advance.

Rene

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