-"var px = document.querySelector('#px'), customAmount = document.querySelector"
-"('#custom-amount'); px.addEventListener('change',function(){ /* Update input "
-"name to prefill FDN form */ if (px.value) { px.name = \"px\"; customAmount."
-"name = \"custom-amount\"; customAmount.value = \"\"; customAmount.style."
-"display = \"none\"; } else { customAmount.style.display = \"inline-block\"; "
-"customAmount.name = \"px\"; px.name = \"dummy_px\"; } });"