Edit in JSFiddle

$(document).ready(function() {
    $('.hoveropen').mouseover(function(e) {
        $(this).target = "_blank";
        window.open($(this).prop('href'));      
    })  
})

<ul style="line-height: 40px; text-align: left;">
        <li><a class="hoveropen" href="http://jquerybyexample.blogspot.com/2010/06/implement-jqueryui-datepicker-with.html">
            <b><span style="color: purple;">Implement jQuery UI DatePicker with ASP.NET</span></b></a></li>
        <li><a class="hoveropen" href="http://jquerybyexample.blogspot.com/2011/08/mostly-asked-jquery-interview-questions.html">
            <b><span style="color: purple;">Mostly asked jQuery interview questions list</span></b></a></li>
         <li><a class="hoveropen" href="http://jquerybyexample.blogspot.com/2012/08/5-top-jquery-clock-tutorials-analog-and.html">
            <b><span style="color: purple;">5 Top jQuery Clock Tutorials (Analog and Digital)</span></b></a>
        </li>
    </ul>