弹出遮罩和对话框

<!--遮罩-->
<div class="createMask"></div>
<!--创建分类弹出对话框-->
<div class="dialogBox"></div>

/*遮罩、对话框
---------------------------------*/
.createMask
{
    z-index:9998;
    position:absolute;
    left:0;
    top:0;
    100%;
    height:100%;
    background:#000;
    opacity:0.5;
    filter:alpha(opacity=50);
    -moz-opacity:0.5;
    display:none;
}
.dialogBox
{
    z-index:9999;
    position:absolute;
    border-radius:5px;
    border:1px solid #ddd;
    background-color:#fff;
    box-shadow:0 0 10px #666;
    display:none;
    padding:10px;
 }