Edit in JSFiddle

Result
HTML
JavaScript
CSS

<table border="1">
    <tr><td>jQuery</td><td>Amazing</td></tr>
    <tr><td>CSS</td><td>Beautiful</td></tr>
    <tr><td>MVC3</td><td>Creative</td></tr>
    <tr><td>CSS3</td><td>Wonderful</td></tr>
</table>

$(document).ready(function()
                  {
                      $("tr:even").addClass("evenTR");
                      $("tr:odd").addClass("oddTR");
                  });

.evenTR
{
    color:Red;
}
.oddTR
{
    color:Green;
}