Creditcard Validation AMEX is not accepted: This validation is in the 4th input box in the credit card input form. Will show error msg when the user input 3 numbers in the 4th input box.

gistfile1.txt

$(document).ready(function() {

	var cc_4 = $("input[name='cc_4']");
	cc_4.blur( function() { // DEV-599
		
		if ( (cc_4.val().length) == 3 ) {

			var no_amex = "Sorry American Express is not accepted.";
			if ( $('#cc_number-E').length ) {

				$('#cc_number-E span').text(no_amex);			
			} else {

				cc_4.after('<div id="cc_number-E" class="errMsg"><span>'+no_amex+'</span></div>');
			}

			$("#cc_number-D").addClass('errFld');
		} else {

			$('#cc_number-E').remove();
			$("#cc_number-D").removeClass('errFld');
		}
		
	});
	
});