Divide in an expression?

At the end of the line (below) I am using an xpath call to get the width from a 
in-memory xml document. I have the need to divide whatever that width comes out 
as by 300. Does anyone know how I can achieve this. The xml I am creating, is 
actually being sent to the adobe graphics server, and when I tried this:
width=\"(reference(adobe-content:myImageInfo2#/imageInfo/psd(_at_)width) / 300) 
it said that was not valid and not an int. Any ideas?


        sb.append("\t<imageSize in=\"original\" resolution=\"72\" 
scalePolicy=\"doNotEnlarge\" constrainProportions=\"true\" 
width=\"reference(adobe-content:myImageInfo2#/imageInfo/psd/@width)\"  />\n");

Thanks
Scott

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