Action Select Not Working

I am trying to get my action page to work where if the user selects yes to Employee radio button then it goes to a certain page, if not it goes to another page. It doesnt do anything on submit and when I do an alert on alert(document.myFrm.employee.action) for test only form submit it gives me Undefined message.

Please advise what I am doing wrong?

function mySelection()
{
if(document.myFrm.employee.value == "yes")
{
document.myFrm.employee.action='gotoEmployee.cfm'
}
else
{
document.myFrm.employee.action='secondPage.cfm'
}
}

...
<form name="myFrm" method="post" onSubmit="return mySelection();">
<input name="employee" type="radio" value="yes">
<input name="employee" type="radio" value="no">
...