the syntax is different for eCart 6 and will need to be hand coded.
change
if (true && (((isset($_SESSION['eCartCheckoutForm_state_province'])?$_SESSION['eCartCheckoutForm_state_province']:"") == "FL"))) {
to:
if (true && (($this->GetTaxableTotal() > 0) && ((isset($_SESSION['WASF_CheckoutWizard_Cool_Default'])?$_SESSION['WASF_CheckoutWizard_Cool_Default']['State']:"") == "FL"))) {