用position做圆角边框

.green-round-new .head{

    position:relative;
    background:url("/images/r_m2.gif") repeat-x scroll 0 0 transparent; /*底图*/
    clear:both;
    height:26px;

    line-height:26px;
}

.green-round-new .head .left{
    background:url("/images/r_m1.gif") no-repeat scroll 0 0 transparent;/*左边*/
    left:0;
    padding-left:10px;
    line-height:26px;
    position:absolute;
}

.green-round-new .head .right{
    background:url("/images/r_m3.gif") no-repeat scroll top right transparent;/*右边*/
    right:0;
    padding-right:10px;
    line-height:26px;
    height:26px;
    position:absolute;
}

 

效果