SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<ul>
    <li class="videoContainer vidLink" id="1581889025">
        <a href="site.com../view/1581889025:49_3eA8F7sPr5FQGZcl2yzx3dz5Y_XwP">
            <span class="HOVER"></span>
            <div class="videoX"><img id="clThumb_1581889025" src="PREVIEW.jpg">
            </div>  </a>
        <a class="videoTitle" href="site.com../view/1581889025:49_3eA8F7sPr5FQGZcl2yzx3dz5Y_XwP">Title of Video</a>
        <span class='not-viewed'></span>
        <div class="tooltip-footer"></div>
    </li>
</ul>

JavaScript

var id = $(".not-viewed").parents('li').attr("id");
var href = $(".videoTitle[href*='" + id + "']").attr("href");
alert(href);