function changelink_switch(){
    document.getElementById('_switch').style.color='#FF9933'; 
     document.getElementById('_switch').style.textDecoration='none';
     document.getElementById('_blue').style.color='#00479C'; 
     document.getElementById('_blue').style.textDecoration='none';
}


function changeback_switch(){
    document.getElementById('_switch').style.color='#ffffff'; 
    document.getElementById('_switch').style.textDecoration='none';
    document.getElementById('_blue').style.color='#ffffff'; 
     document.getElementById('_blue').style.textDecoration='none';
}

function changelink_blue(){
   document.getElementById('_blue').style.color='#00479C'; 
    document.getElementById('_blue').style.textDecoration='none';
     document.getElementById('_switch').style.color='#FF9933'; 
    document.getElementById('_switch').style.textDecoration='none';
}

function changeback_blue(){
    document.getElementById('_blue').style.color='#ffffff'; 
     document.getElementById('_blue').style.textDecoration='none';
     document.getElementById('_switch').style.color='#ffffff'; 
    document.getElementById('_switch').style.textDecoration='none';
}


<!-- Begin
var billing_fname = "";
var billing_lname = "";
var billing_email_address = "";
var billing_Company = "";
var billing_address_1= "";
var billing_city = "";
var billing_state = "";
var billing_stateIndex = 0;
var billing_zip_code = "";
var billing_phone = "";

function InitSaveVariables(form) {
billing_fname = form.billing_fname.value;
billing_lname = form.billing_lname.value;
//billing_email_address = form.billing_email_address.value;
billing_address_1= form.billing_address_1.value;
billing_city = form.billing_city.value;
billing_zip_code = form.billing_zip_code.value;
billing_stateIndex = form.billing_state.selectedIndex;
billing_state = form.billing_state[billing_stateIndex].value;
billing_phone = form.billing_phone.value;
}

function billing_ToBillPerson(form) {
if (form.copy.checked) {
InitSaveVariables(form);
form.billing_fname.value = form.fname.value;
form.billing_lname.value = form.lname.value;
//form.billing_email_address.value = form.email_address.value;
form.billing_address_1.value = form.address_1.value;

form.billing_city.value = form.city.value;
form.billing_zip_code.value = form.zip_code.value;
form.billing_state.value = form.state.value;
form.billing_phone.value = form.phone.value;
}
else {
form.billing_fname.value = billing_fname;
form.billing_lname.value = billing_lname;
//form.billing_email_address.value = billing_email_address;
form.billing_address_1.value = billing_address_1;
form.billing_city.value = billing_city;
form.billing_zip_code.value = billing_zip_code;       
form.billing_state.selectedIndex = billing_stateIndex;
form.billing_phone.value = billing_phone;
   }
}
//  End -->