对角线渐变:
<body style="FILTER: progid:DXImageTransform.Microsoft.Alpha( style=1,opacity=25,finishOpacity=100,startX=50,finishX=100,startY=50,
finishY=100); BACKGROUND-COLOR: green">
上下渐变：
<body leftmargin="0" topmargin="0" style="filter:progid:DXImageTransform.Microsoft.Gradient(
startColorStr='#000000', endColorStr='#ffffff', gradientType='0')">
左右渐变：
<body leftmargin="0" topmargin="0" style="filter:progid:DXImageTransform.Microsoft.Gradient(
startColorStr='#000000', endColorStr='#ffffff', gradientType='1')">