menu hover

i want to use mouse hover on menu bar in admin master so that i get the dropdown auto on mouse hover  ... using javacript or css 
but i dont know how shoud i do 
my start of admin master toolbar 
<tr>
<td id="td2" runat="server" width="20%" align="left" class="menu-brd menu-link">
<a href="../Webpages/TaskSheet.aspx" class="menu-link">TaskSheet</a>
</td>
......
</tr>

i tried inserting in tr but its not accepting any other idea
...