Hi lisamaclea,

Use the below code.

<script type="text/javascript" src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script type="text/javascript">
    $(function () {
        $('body').on("click", "[src*=plus]", function () {
            $(this).closest("tr").after("<tr><td></td><td colspan = '999'>" + $(this).next().html() + "</td></tr>")
            $(this).attr("src", "images/minus.png");
        });
        $('body').on("click", "[src*=minus]", function () {
            $(this).attr("src", "images/plus.png");
            $(this).closest("tr").next().remove();
        });
    });
</script>

For more details refer below article.

jQuery Live Click not working with error Live is not a function