用网页技术CSS实现网页背景渐变

用网页技术CSS实现网页背景渐变的四种代码设置。  
[b]一、从上往下渐变[/b]  
body{
FILTER: progid:DXImageTransform.Microsoft.Gradient(gradientType=0,startColorStr=#ffffff,endColorStr=#000000);
}  
[b]二、从左上至右下渐变[/b]  
body{
FILTER: Alpha( style=1,opacity=25,finishOpacity=100,
startX=50,finishX= 100,startY=50,finishY=100);
background-color: skyblue;
}  
[b]三、从左往右渐变[/b]  
body{
FILTER: progid:DXImageTransform.Microsoft.Gradient(gradientType=1,startColorStr=#ffffff,endColorStr=#000000);
}  
[b]四、从上往下渐变[/b]  
style="filter:progid:DXImageTransform.microsoft.gradient(gradienttype=0,startColorStr=blue,endColorStr=white);"