Check Box To Autofill Bill To Address

[Dschrepfer]

Hello,
 
I have been working on this code all day trying to get it to work in my form.  I have a check box named "BillTo_Same" and when it is checked I want the customer address to auto fill the Bill To address.  I'm not sure why this isn't working...  All my ID's match the system correctly and the code is in the footer of my form.
 
 
Any help would be appreciated.
 
<script>

function f_address()
{
if(document.getElementById('BillTo_Same').checked)
     {
  document.getElementById('InsertRecordBillToName').value=document.getElementById('InsertRecordCompany').value;
document.getElementById('InsertRecordBillToAddress').value=document.getElementById('InsertRecordAddress').value;
document.getElementById('InsertRecordBillToCity').value=document.getElementById('InsertRecordCity').value;
document.getElementById('InsertRecordBillToState').value=document.getElementById('InsertRecordState_Province').value;
document.getElementById('InsertRecordBillToZip').value=document.getElementById('InsertRecordZip_Code').value;
document.getElementById('InsertRecordBillToCountry').value=document.getElementById('InsertRecordCountry').value;
} else {
document.getElementById('InsertRecordBillToName').value="";
document.getElementById('InsertRecordBillToAddress').value="";
document.getElementById('InsertRecordBillToCity').value="";
document.getElementById('InsertRecordBillToState').value="";
document.getElementById('InsertRecordBillToZip').value="";
document.getElementById('InsertRecordBillToCountry').value="";
}


}
document.getElementById('BillTo_Same').onclick= f_address;
</script>

[Dschrepfer]

I figured out why it wasn't working.  I needed the ID for my checkbox to be 'insertRecordBillTo_Same'.  The sad part is that I stared at this code all day yesterday wondering why it wouldn't work.  Today I caught my error right away...