-"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\"; } });"