ie6, ie8 과 파이어폭스에서 css width값 동일하게 맞추기

<style type="text/css">
#wrap {width:1040px; margin:0; padding:0px;}
#navi {height:60px; margin:0; padding:0; background-color:#f1f1f1;}
#navi_left {
float:left;
padding:0;
overflow:hidden;
width:208px; height:30px;
border:1px solid #333;
/*\**/:width:210px; /* ie용 핵 */
}

#navi_center {
float:left;
padding:0;
overflow:hidden;
width:618px; height:30px;
border:1px solid #333;
/*\**/:width:620px; /* ie용 핵 */
}

#navi_right {
float:right;
padding:0;
overflow:hidden;
width:208px; height:30px;
border:1px solid #333;
/*\**/:width:210px; /* ie용 핵 */
}
</style>


<div id="wrap">
<div id="navi">

<div id="navi_left">좌측공간</div>

<div id="navi_center">중앙-contents</div>

<div id="navi_right">우측공간</div>

</div>
</div>

</body>
</html>

dtd xhtml 선언후 <meta http-equiv="X-UA-Compatible" content="IE=edge" />
메타 선언하면 똑같이 그나마 똑같이 먹음. 하지만 조금씩은 틀리다는거;;