Check box triggers on check... won't clear on uncheck.

The following JavaScript works great to autocheck and auto fill when checking CB04. If I make a mistake and check CB04 and need to uncheck it, I need the script to undo the other boxes/fields that were mistakingly filled.

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var c04 = this.getField("CB04");
var c06 = this.getField("CB06");
var f03 = this.getField("FE03");  // Example: JOE
var f04 = this.getField("FE04");  // Example: WORKMAN
var f10 = this.getField("FE10");
var f12 = this.getField("FE12");
var f13 = this.getField("FE13");

if(c04.isBoxChecked(0,true)){
c06.checkThisBox(0,true);
f10.value = f03.value + " " +f04.value; 
f12.value = "JOHN WORKSALOT";
f13.value = "GEORGE DOESNT";
}