How do I return the page width and height as a text variable?

Hi
I'm trying to create a media box for use in job to return information in the slug area. I have a script that will return the username of the computer as a text variable but I would also like to return the height and width in mm as a text variable too. Does anyone know how to this please?
Thanks

Hi Vamitul
Thank you for your response. I very new to scripting so I hope you'll bare with me.
How do I apply your code to indesign please? At the moment I have a script that returns the computer user name(an online script i found called 'addCustomVariables_103.jsx') that's going to be one of the variables I use in my media box. This lives in the startup scripts folder but i'm guessing I can't just add your code to it as yours will require an open document to return any values. How would I apply your code so it works in inDesign? Ideally i could do with this automatically adding the text variables at startup as I'll be installing this on several machines.
Thanks once again for your assistance.

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import java.awt.Graphics2D;
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 private int _imgHeight = 0;
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 Iterator readerIter = ImageIO.getImageReaders(fis);
 ImageReader reader = null;
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 * @since version XXX
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 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
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 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
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 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
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 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
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 public void setImgHeight(int i)
 _imgHeight = i;
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
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 * @since Mar 25, 2008
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Figured it out. The files have a different vertical and horizontal resolutions. In this case the horizontal resolution is 200 DPI and the vertical is 100 DPI. The imgage width and height values are based on those resolution values. I wrote a section of code to take care of the problem (at least for TIFF 6.0)
 private void setPageSize(int pageNum) throws IOException
 IIOMetadata imageMetadata = _reader.getImageMetadata(pageNum);
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 double yPixles = ifd.getTIFFField(257).getAsDouble(0);
 double xRes = ifd.getTIFFField(282).getAsDouble(0);
 double yres = ifd.getTIFFField(283).getAsDouble(0);
 int resUnits = ifd.getTIFFField(296).getAsInt(0);
 double imageWidth = xPixles / xRes;
 double imageHeight = yPixles / yres;
 //if units are in CM convert ot inches
 if (resUnits == 3)
 imageWidth = imageWidth * 0.3937;
 imageHeight = imageHeight * 0.3937;
 //convert to pixles in 72 DPI
 imageWidth = imageWidth * 72;
 imageHeight = imageHeight * 72;
 setImgWidth((int) Math.round(imageWidth));
 setImgHeight((int) Math.round(imageHeight));
 setImgAspectRatio(imageWidth / imageHeight);
 }

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