레이어팝업 배경이 되는 div를 높이100% 넓이100%까진 했는데 브라우져 크기가 변했을때 리사이즈되게 하는

방법을 몰라서 문의드려요. 스크립트 고수님들 도와주세요.

<div>

<table width=1120 height="27" cellpadding=0 cellspacing=0 onmouseover=this.style.background="#dddddd" onmouseout=this.style.background="" style="cursor:pointer;" onclick="view_content(this)" id="faq_{.sno}">

<tr height=27>
 <td align="left" width="24" valign="top" style="padding-top:5px;"><img src="../img/common/faq_q.gif" style="margin-top:3px;"></td>
    <td align="left" valign="top" style="padding-top:5px;"><font style="font-size:15px; font-weight:bold;"><a href="../service/test.php?sitemcd={.codenum}" target="new">질문</font></td>
    <td align="left">답변</td>
</tr>
</table>
<div style="display:none; position:absolute; top:0px; left:0px; text-align:center; z-index:1000; background-image:url(../img/new/back.png);" onclick="view_content(this)" id="faq_{.sno}">
 <table cellpadding=0 cellspacing=0 border=0 width="100%">
    <tr><td height="200"></td></tr>
 <tr valign="top">
  <td style="text-align:center;"><iframe src="../service/test.php?sitemcd={.codenum}" width="890" height="900" style="background-color:#ffffff;" scrolling="no" frameborder="0"></iframe></td>
 </tr>
 </table>
</div>
<div style="height:15px;"></div>

<br><br>

</div><!-- End indiv -->

<script language="javascript">
var preContent;
var windowWidth = $(window).width();
var windowHeight = $(window).height();

function view_content(obj)
{
 var div = obj.parentNode;

 for (var i=1, m=div.childNodes.length;i<m;i++) {
  if (div.childNodes[i].nodeType != 1) continue; // text node.
  else if (obj == div.childNodes[ i ]) continue;

  obj = div.childNodes[ i ];
  break;
 }

 if (preContent && obj!=preContent){
  obj.style.display = "block";
  preContent.style.display = "none";
 }

 
 else if (preContent && obj==preContent) preContent.style.display = ( preContent.style.display == "none" ? "block" : "none" );
 else if (preContent == null ) obj.style.display = "block";
 obj.style.width = windowWidth;
 obj.style.height = windowHeight;
 
 preContent = obj;
}

{ // 초기출력
 var no = "faq_{_GET['ssno']}";
 if ( document.getElementById( no ) ) view_content( document.getElementById( no ) );
}
</script>​