Broken Code?

Hello, I have used this code many times, but something is wrong and I can’t figure it out for the life of me. This code works great for FAQ drop down Question and Answers. I have noticed many people asking how to do this. If you can help me fix the code, we can offer it to others for this great option.

Question No. 1 does not work, but Question No. 2 does.

`<b>Question 1. ?</b>
<div id=”a” style=”display: none;”>

• Answer Goes Here.

</div>

<b>Question 2? </b>
<div id=”b” style=”display: none;”>

• Answer Two.

</div>
<script type=”text/javascript” language=”JavaScript”>// <![CDATA[
function toggle(tag) {
if (tag.style.display==”) {
tag.style.display=’none’
} else {
tag.style.display=”
}
}

// ]]></script>

Can you help me fix my mistake?