JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<table>
    <tbody style="height: 500px; overflow-x: hidden; overflow-y: scroll;">
                                                <tr id="row0" class="alternate clickable">
                        <td>                            <img width="11" height="11" title="This email failed to send." alt="Failed" src="images/error_warning.png">
                                                    <br>
                            <input type="checkbox" value="6751" name="emailCheck[]" class="emailCheck"></td>
                        <td><a href="user_settings.php?id=349">
                            wmiller                 </a></td>
                        <td>New Fin-iQ Message</td>
                        <td><span class="errorText">UNKNOWN</span></td>
                        <td>New Bulletin Notification</td>
                        <td>Jun. 07/10 10:14:39 am</td>
                        <td><a href="emails_report.php?action=re&amp;id=6751">Resend</a>
                            <br>
                            <a id="emailBodyToggle_6751" href="javascript:showEmail(6751)">Show</a>
                        </td>
                    </tr>
<tr id="emailBody_6751" style="display: none; text-align: left;" class="alternate">
                    <td colspan="7"><div>...</div></td>
                </tr>
                                                <tr id="row1" class=" clickable">
                    <td>                            <img width="11" height="11" title="This email failed to send." alt="Failed" src="images/error_warning.png">
                                                <br>
                        <input type="checkbox" value="6752" name="emailCheck[]" class="emailCheck"></td>
                    <td><a href="user_settings.php?id=350">
                        mholman                 </a></td>
                    <td>New Fin-iQ Message</td>
            ...

JavaScript

$("tr.clickable").click(function() {
    var cb = $("td:first > input", this)[0];
    cb.checked = !cb.checked;
});