any web site developers out there?

i have a question for you web site developers.

i recently had to convert a small, internal website from html auto generated by php to html/css auto generated by php. so, viewing the website in internet explorer, it looks the way i expect, but when i view the website in firefox, it appears that it is ignoring boarders and padding (but it does respect the margin and height parameters).

does anyone have any experience with this or has run into this issue as well?

here is an example css block that i am ussing:
margin and height work, but boarder and padding do not.

Code:

 
 <div id="channelInfoHeader">
     CHANNEL INFO
 </div> 
 
#channelInfoHeader {
    /*top right bottom left*/
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 12px;
    font-weight: bold;
    font-style: normal;
    text-align: center;
    color: #000000;
    background-color:#CCCCCC;
    margin: 0 17px 0 17px;
    border: 1px 1px 1px 1px solid #000000;
    padding: 5px 0 0 0;
    height: 20px;
}

thanks in advance.