Hi,
May the below code also helpful,
as you mention as "custom" document size:
app.activeDocument.viewPreferences.horizontalMeasurementUnits = MeasurementUnits.inches;
app.activeDocument.viewPreferences.verticalMeasurementUnits = MeasurementUnits.inches;
var myPages = app.activeDocument.pages;
alert(myPages.length)
for(i=0; i<myPages.length; i++)
{ myPages[i].marginPreferences.bottom = "0.25 in"; myPages[i].marginPreferences.top = "0.25 in"; myPages[i].marginPreferences.left = "0.25 in"; myPages[i].marginPreferences.right = "0.25 in"; }
Regards
Siraj