🚀 go-pugleaf

I'm hacking my way through my first JavaScript, and have run into one specific problem. I'm trying to script adding a shadow to the selected item. The script below works. The blend mode and blur radius get set properly, but the mySelection.shadowxOffset = 3 and mySelection.shadowyOffset = 3 lines have no effect. No matter what values I assign to shadowxOffset and shadowyOffset, I get exactly the same shadow offset. What is going on here? Running ID CS, Windows XP.

//First, check to see whether any InDesign documents are open.
//If no documents are open, display an error message.
if (app.documents.length > 0){
if (app.selection.length > 0) {
//Something is selected.
var mySelection = app.selection[0];
mySelection.shadowMode = 2020623440
mySelection.shadowBlendMode = 2020625762
mySelection.shadowOpacity = 20
mySelection.shadowxOffset = 3
mySelection.shadowyOffset = 3
mySelection.shadowBlurRadius = 10
}
else {
//Nothing is selected, so display an error message.
alert("Nothing is selected. Please select an object and try again.")
}
}
else {
//No documents are open, so display an error message.
alert("No InDesign documents are open. Please open a document and try again.")
}