My code not adding += score.

Need a bit of help with this code.

The score is not adding up and the document.write keeps reporting a 0 score even when answering correctly.

Here is the code....thanks in advance for any help:

var correct = 0;

var answer1 = prompt("Whats the capital of Ireland"); if (answer1.toUpperCase() === "Dublin"){ correct += 1; }

var answer2 = prompt("Whats the capital of America"); if (answer2.toUpperCase() === "New York"){ correct += 1; }

var answer3 = prompt("Whats the capital of England"); if (answer3.toUpperCase() === "London"){ correct += 1; }

var answer4 = prompt("Whats the capital of France"); if (answer4.toUpperCase() === "Paris"){ correct += 1; }

var answer5 = prompt("Whats the capital of Wales"); if (answer5.toUpperCase() === "Cardiff"){ correct += 1; }

document.write("<p>You guessed " + correct + " questions correctly.</p>");