JS error now contains invalid user number.

src/sbbs3/js_user.c

@@ -801,7 +801,7 @@ js_user_constructor(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval
 	JS_ValueToInt32(cx,argv[0],&val);
 	user.number=(ushort)val;
 	if(user.number!=0 && getuserdat(scfg,&user)!=0) {
-		JS_ReportError(cx,"Invalid user number");
+		JS_ReportError(cx,"Invalid user number: %d",val);
 		return(JS_FALSE);
 	}