js 彈出DIV

js如下:
<script language="javascript"> 
//登陸彈出對話框，並使背景元素不可用
var div_width = 300;
var div_height = 200;
function showWindow(width,height){ 
location.href="#";
width = div_width;
height = div_height
var windowstr= document.getElementById("popLayer").innerHTML;
document.getElementById("infoDiv").innerHTML=windowstr; 
document.getElementById("infoDiv").style.left=((document.body.clientWidth-width)>0?(document.body.clientWidth-width):0)/2+"px"; 
document.getElementById("infoDiv").style.top=200+"px"; 
document.getElementById("infoDiv").style.zIndex=10001;
document.getElementById("infoDiv").style.width=width; 
document.getElementById("infoDiv").style.height=height; 
document.getElementById("infoDiv").style.border="3px solid #0099ff";
document.getElementById("tranDiv").style.height=document.body.clientHeight+ "px"; 
document.getElementById("tranDiv").style.width=document.body.clientWidth+ "px"; 
document.getElementById("tranDiv").style.display=""; 
document.getElementById("tranDivBack").style.display=""; 
document.getElementById("tranDivBack").style.zIndex=10000;
document.getElementById("infoDiv").style.display=""; 
} 
function closeWindow(){ 
document.getElementById("tranDiv").style.display="none"; 
} 

</script> 


頁面中：
<!--層遮罩部分-->
<div style="position:absolute;display:none; left:0px; top:0px;" id="tranDiv">
<div style="position:absolute;left:0px; top:0px; width:100%; height:100%;background-color:#000000;filter:alpha(Opacity=30)" id="tranDivBack"> </div> 
<div align='center'style='position:absolute;left:0px; top:0px; width:100%; height:100%; background-color:#e5edf5;background-image:url(images/bestnetqywimg/tccbg.gif);'  id='infoDiv'></div> 
</div> 
<!--層遮罩部分結束-->
<!--彈出層登錄-->
<div id="popLayer" style="display:none"><form id="formdl" name="formdl" method="post" action=""><br /><font align="center" color="#0000ff" size="3"><b>---手機號碼先登錄---</b></font><br /><br />

  <br/>
  <input type="submit" name="Submit" class="bntccanniu" value="登錄" /> <input type="button" name="Submit1" class="bntccanniu" value="取消" οnclick="closeWindow();"/>
  
</form>
</div> 
<a href="javascript:;">點擊此處看看</a>