you can test against null.
for example:
/**
* Will return the width of the given frame.
*
*
*/
UI.prototype.ui_getWindowWidth = function
(
frame, // The frame of interest
doc // The document in the frame
)
{
var windowWidth = frame.innerWidth;
if (windowWidth == null) {
windowWidth = doc.body.clientWidth;
}
return windowWidth;
}
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