Creating Spot color in InDesign CS4, js

Hi,

I have this code:

try{
myColor = myDoc.colors.item("EMBOSS");
myName = myColor.name;
}
catch (e){
myColor = myDoc.colors.add({name:"EMBOSS", model:ColorModel.SPOT,
colorValue:[100, 0, 0, 0]});
}

But the color created still process. How do I change it to spot color.

Thank you.