css - How to add table highlighting in PHP? -

hi. wanna know how add table row highlighting everytime user hovers mouse. able alternate row color. total novice in web programming , have little knowledge of javascript. pls me this.

here codes:

display.php:

<table class="table_data">  <tr>   <th><nobr>id</nobr></th>   <th><nobr>first names</nobr></th>   <th><nobr>gender</nobr></th>  </tr>   <?php    $row_ctr = 1;    while ($first_names_array = mysql_fetch_array($first_names)) {    if (($row_ctr % 2) == 0) $alternate = "even";    else $alternate = "odd";     echo "<tr>";    echo "<td class='$alternate'><nobr>"  .  $first_names_array['id'] . "</nobr></td>";    echo "<td class='$alternate'><nobr>" . $first_names_array['first_name'] . "</nobr></td>";    echo "<td class='$alternate'><nobr>" . $first_names_array['gender'] . "</nobr></td>";    echo "</tr>";     $row_ctr += 1;   }  ?>   </tr> </table> 

and in css:

style.css

.odd {  background-color: #525252; }  .even {  background-color: #b7acc6; }  .highlight {   background-color: #ff0; } 

i don't have slightest idea how i've said row color alternation working. highlight having trouble with. total novice said earlier. pls help..

use class tr , following properties

 echo "<tr class='highlightrow'>";    echo "<td class='$alternate'><nobr>"  .  $first_names_array['id'] . "</nobr></td>";    echo "<td class='$alternate'><nobr>" . $first_names_array['first_name'] . "</nobr></td>";    echo "<td class='$alternate'><nobr>" . $first_names_array['gender'] . "</nobr></td>";    echo "</tr>"; 

and css .highlightrow

.highlightrow:hover td {   background-color: black;   color: white;   cursor: pointer; }