川贝批把糖浆:网页高手进来看看

<style type="text/css">
td{color:#000000;
font-size:12px}
a{color:#0000ff;
font-size:12px;
text-decoration:none}
a:hover{color:000099;
font-size:12px;
text-decoration:none;
}
a.a1{color:#000099;
font-size:12px;
text-decoration:none}
a.a1:hover{color:d13d2c;
font-size:12px;
text-decoration:none}
a.a2{color:#003399;
font-size:12px;
text-decoration:none}
a.a2:hover{color:0000ff;
font-size:12px;
text-decoration:underline}
a.a3{color:#ffffff;
font-size:12px;
text-decoration:none}
a.a3:hover{left:1px;
color:ffffff;
position:relative;
top:1px;
font-size:12px;
text-decoration:none}
a.a4{color:#003399;
font-size:12px;
text-decoration:none}
a.a4:hover{color:0000ff;
font-size:12px;
text-decoration:none}
.menubar {
BACKGROUND: #f9f9f9; WIDTH: 80px; CURSOR: default; COLOR: 990000; POSITION: absolute; TOP: 205px; HEIGHT: 20px
}
.menu {

BORDER-RIGHT: 1px solid #cccccc; letter-spacing:1.5px; line-height:20px; PADDING-RIGHT: 5px; BORDER-TOP: white 2px outset; DISPLAY: none; PADDING-LEFT: 5px; BACKGROUND: d13d2c; PADDING-BOTTOM: 5px; BORDER-LEFT: 1px solid #cccccc; WIDTH: 110px; PADDING-TOP:5px; BORDER-BOTTOM: 1px solid #cccccc; POSITION: absolute; TOP: 225px
}
.menu A {
COLOR: ffffff;
TEXT-DECORATION: none
}
.menu A:hover {
COLOR: #ffff00;
TEXT-DECORATION: none
}

</style>
这段代码是什么意思？要具体的。。
1楼的能详细的说说吗？
满意的话可以给分