need help with onmouseover for category list

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I have this code to do onmouseover to change color of background color when you hover. I can not find the correct location to put the code. I have put it in several place but I either get no change or an error. This is the code:

 

<td class="btnav" onmouseover="categorybox.backgroundColor='#84DFC1';"

onmouseout="categorybox.backgroundColor='#84C1DF'"></td>

 

categorybox is class name I made to configure my category list box in the stylesheet

 

This is the line added to the stylesheet:

#categorybox.btnav { background-color: #84C1DF; border: 1px #000000 solid;}

 

Thanks in advance for any help.