Adobe Extending Dreamweaver CS4 - Manual (Page 207)

201 EXTENDING DREAMWEAVER CS4
Reports
Arguments
platform
The value of the platform argument is either "macintosh" or "windows" , depending on the user’s platform.
Returns
Dreamweaver expects a string of the form
"widthInPixels,heightInPixels" .
The returned dimensions are smaller than the size of the entire dialog box because they do not include the area for the
OK and Cancel buttons. If the returned dimensions do not accommodate all options, scroll bars appear.
Example
The following instance of the
windowDimensions() function sets the dimensions of the Parameters dialog box to 648
x 520 pixels:
function windowDimensions(){
return "648,520";
}