Some bits to help you form your function:
if ( $j("input#PaymentMethodType_1:checked").val() == "1" )
{
}
if ( $j("input#PaymentMethodType_3:checked").val() == "3" )
{
}
if ( $j("input#PaymentMethodType_5:checked").val() == "5" )
{
}
if ( $j("input#PaymentMethodType_7:checked").val() == "7" )
{
}
if ( $j("input#PaymentMethodType_8:checked").val() == "8" )
{
}
$j("#PaymentMethodType_1").change(function()
{
if ( $j(this).val() == "1" )
{
}
});
$j("#PaymentMethodType_3").change(function()
{
if ( $j(this).val() == "3" )
{
}
});
$j("#PaymentMethodType_5").change(function()
{
if ( $j(this).val() == "5" )
{
}
});
$j("#PaymentMethodType_7").change(function()
{
if ( $j(this).val() == "7" )
{
}
});
$j("#PaymentMethodType_8").change(function()
{
if ( $j(this).val() == "8" )
{
}
});
if ( $j("#Amount").val() == "0.00" )
{
}
These are only bits of examples to help show you what you can do. You can .show() and .hide() elements as you need to.
The first set are on page load, the latter set if a set of radio buttons are changed.
Having a value of 0.00 is the gift voucher/free use cases and you can run things and show/hide as you need to with regard to this.
You could even do things like description area that changes depending on the payment type as well for example.
