PHP中css背景图片设置

/* begin overall style */
body
{
margin: 0;
padding: 0;
background: purple;
color: #6666ff;
font: normal 10pt Arial,Helvetica,sans-serif;
background:white url(bg.gif) repeat-x left top;
}

#header
{
margin: 0;
padding: 0;
height: 100px;
}

#logo
{
padding: 5px 0 5px 10px;
font-size: 200%;
}

#mainmenu
{
position: absolute;
top: 59px;
}

#mainmenu ul
{
padding: 0;
margin: 0;
padding: 0.4em 0 0.3em 0;
}

#mainmenu ul li
{
display: inline;
}

#mainmenu ul li a
{
padding: 0.4em 0.4em;
color: white;
text-decoration: none;
font-weight: bold;
}

#mainmenu ul li a:hover, #mainmenu ul li a.active
{
background: #E6F2FF;
color: #6399cd;
}

#content
{
    position: relative;
    width: 95%;
    margin: 0 auto;
    padding: 0px;
}

#footer
{
padding: 15px;
margin: 20px 0 0 0;
font-size: 0.8em;
text-align: center;
border-top: 1px solid #EEE;
}
/* end of overall style */

/* begin data grid style */
table.dat