关于div的定位显示问题

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CSS JavaScript Cache Struts HTML

代码如下：

<html>
6

<head>
7

<title>NetShop Management Category Add Panel
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</title>
9

16

<script>
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function showTree(a)
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{
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document.getElementById('divTree').style.display = "block";
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document.getElementById('divTree').style.left=a.offsetLeft+'px'
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document.getElementById('divTree').style.top=a.offsetTop+ a.offsetHeight+'px'
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}
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function hideTree(a)
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{
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document.getElementById('divTree').style.display="none";
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}
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function insertValue(oNode)
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{
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document.getElementById('parentCategoryName').value = oNode.text;
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document.getElementById('parentCategoryId').value = oNode.id;
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document.getElementById('divTree').style.display = "none";
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//alert(oNode.id);
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}
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</script>
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</head>
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<body>
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<form name="categoryForm" method="post" action="/NetShop/manage/categoryAdd.do">
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<br />
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<br />
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<table border="1" cellpadding="4" cellspacing="0" width="600"
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align="center">
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<tr>
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<td></td>
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<td></td>
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<td></td>
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</tr>
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<tr>
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<td>
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Select Parent Category Name:
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</td>
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<td>
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<input type="text" name="parentCategoryName" value="" onfocus="showTree(this);">
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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Category Name:
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</td>
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<td>
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<input type="text" name="categoryName" value="">
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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Description:
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</td>
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<td>
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<textarea name="categoryDescription"></textarea>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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Status:
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</td>
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<td>
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<select name="categoryStatus" size="1"><option value="NORMAL">Normal</option>
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<option value="LOCKED">Locked</option>
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<option value="DELETED">Deleted</option></select>
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</td>
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<td>
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</td>
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</tr>
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</table>
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<input type="hidden" name="parentCategoryId" value="">
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<br />
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<br />
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<br />
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<input type="submit" value="Submit">
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<input type="submit" name="org.apache.struts.taglib.html.CANCEL" value="Reset" onclick="bCancel=true;">
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</form>
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<div id="divTree"
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style="overflow-y:auto;height:200px;width:70px;display:none;position:relative;background-color:#FFF;z-index:1000;border-style:solid;border-color:#ACAA9C;border-width:1px">
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var tree=new WebFXLoadTree("dictionaries","dictionaries.xml");
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var ti0 = new WebFXTreeItem("Item 0");
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tree.add(ti0);
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tree.write();
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tree.expand();
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</script>
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</div>
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</body>
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</html>
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改了后：