childnodes problem

I'm really new to web programming. I've got the following code:
<div id = "divrow1" name="divrow1">
<tr id="row1.1" style="display=none;" name="row1.1">
<td>&nbsp;<img id= 'imgrow1.1' src='images/plus.gif' <onclick='changeVis("row1.1", 3);' > Welcome</td>
<td>1</td>
<td>2</td>
<td>3</td>
</tr>
</div>

div = document.getElementById("divrow1");
Why do I get zero for div.childNodes.length?
Thank you

 

You can't have a tr element inside a div element. <tr> needs to be enclosed within <table> tags

 

it's all within a <table> tag:
<table id = "table1" border="1">
<tbody>
<tr>
<th></th>
<th>First</th>
<th>Second</th>
<th>Third</th>
</tr>
<tr id="row1" name="row1" >
<td><img id= 'imgrow1' src='images/plus.gif' onclick='changeVis("row1", 2);' > Israel</td>
<td>1</td>
<td>2</td>
<td>3</td>
</tr>
<div id = "divrow1" name="divrow1">
<tr id="row1.1" style="display=none;" name="row1.1">
<td>&nbsp;<img id= 'imgrow1.1' src='images/plus.gif' onclick='changeVis("row1.1", 3);' > Welcome Screen</td>
<td>1</td>
<td>2</td>
<td>3</td>
</tr>
</div>

and so on... How can I get the childNodes of the div "divrow1"?

 

Thats wrong. Inside a table, a div element can exist only inside a <td> or <th> element.