it worked i get a regular value, but the yes button does not give the price after discount value! help me with the bold line please.
var oFldSel = this.getField("Group2");
var oFldSub = this.getField("COST2");
event.value = oFldSub.value; // assume no discount;
if(oFldSel.value == "Yes") {
// compute discount
event = oFldSub.value * 0.8;
}