input的样式定义

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/*在IE中*/
input{
background-color:expression(this.type=="text"?"#e3e3e3":"none");
border-bottom:expression(type=="text"?"#000 solid 1px":"none");
} 
/*在Firefox中*/
input[type="text"] {
    background-color: #E3E3E3;
border:#000 solid 1px;
}