侧栏工具栏

<div class="toolbar">
<a href="javascript:;" class="toolbar-item toolbar-item-weixin">
<span class="toolbar-layer"></span>
</a>
<a href="javascript:;" class="toolbar-item toolbar-item-feedback"></a>
<a href="javascript:;" class="toolbar-item toolbar-item-app">
<span class="toolbar-layer"></span>
</a>
<a href="javascript:;" class="toolbar-item toolbar-item-top"></a>
</div>

.toolbar-item,.toolbar-layer{
background-image: url("images/toolbar.png");
background-repeat: no-repeat;
}
.toolbar{
position: fixed;left: 50%;bottom: 5px;margin-left: -26px;
}
.toolbar-item{
display: block;width: 52px;;height: 52px;
margin-top: 1px;position: relative;transition: background-position 1s;
}
.toolbar-item:hover .toolbar-layer{opacity: 1;filter: alpha(opacity=100);transform: scale(1)}
.toolbar-item-weixin{background-position: 0 -798px}
.toolbar-item-weixin:hover{background-position: 0 -860px}
.toolbar-item-weixin .toolbar-layer{height: 212px;background-position: 0 0}
.toolbar-item-feedback{background-position: 0 -426px}
.toolbar-item-feedback:hover{background-position: 0 -488px}
.toolbar-item-app{background-position: 0 -550px}
.toolbar-item-app:hover{background-position: 0 -612px}
.toolbar-item-app .toolbar-layer{height: 194px;background-position:0 -222px}
.toolbar-item-top{background-position: 0 -674px}
.toolbar-item-top:hover{background-position: 0 -736px}

.toolbar-layer{
position: absolute;
right: 52px;
bottom: -6px;
width: 172px;
background-image: url("images/toolbar.png");
background-repeat: no-repeat;
opacity: 0;
filter: alpha(opacity=0);
transform-origin: 95% 95%;
transform: scale(0.01);
transition: all 1s;
}

.toolbar-item,.toolbar-layer{
background-image: url("images/toolbar.png");
background-repeat: no-repeat;
}
.toolbar{
position: fixed;left: 50%;bottom: 5px;margin-left: -26px;
}
.toolbar-item{
display: block;width: 52px;;height: 52px;
margin-top: 1px;position: relative;transition: background-position 1s;
}
.toolbar-item:hover .toolbar-layer{opacity: 1;filter: alpha(opacity=100);transform: scale(1)}
.toolbar-item-weixin{background-position: 0 -798px}
.toolbar-item-weixin:hover{background-position: 0 -860px}
.toolbar-item-weixin .toolbar-layer{height: 212px;background-position: 0 0}
.toolbar-item-feedback{background-position: 0 -426px}
.toolbar-item-feedback:hover{background-position: 0 -488px}
.toolbar-item-app{background-position: 0 -550px}
.toolbar-item-app:hover{background-position: 0 -612px}
.toolbar-item-app .toolbar-layer{height: 194px;background-position:0 -222px}
.toolbar-item-top{background-position: 0 -674px}
.toolbar-item-top:hover{background-position: 0 -736px}

.toolbar-layer{
position: absolute;
right: 52px;
bottom: -6px;
width: 172px;
background-image: url("images/toolbar.png");
background-repeat: no-repeat;
opacity: 0;
filter: alpha(opacity=0);
transform-origin: 95% 95%;
transform: scale(0.01);
transition: all 1s;
}

设置透明度：opacity: 0;
兼容ie方式filter: alpha(opacity=0);

设置起始点：transform-origin: 95% 95%;
缩放动画：transform: scale(0.01);