适配各种访问器的情况全透明实际效果

 style type="text/css" 
body { background-color:#0099CC;}
a {color:#000;}
#snake{
 backgournd: #666;
 border:1px #000000 solid;
 width:500px;
 filter:alpha(opacity=50); /*IE*/
 -moz-opacity:0.5; /*MOZ , FF*/
 opacity:0.5;/*CSS3, FF1.5*/
 /style