Hi,
I'm having some display trouble in IE with the following HTML and Css.
I believe it has something to do with the border-collapse property (but not completely sure about it):
Code:
table.Container_Default
{
	width: 100%;
	border-collapse: collapse;
	vertical-align: top;
	padding:0px;
}
table.Container_Default td
{
	border: 1px solid black;
	height: 28px;
}
tr.test td {	border:1px solid blue; }
tr.Header_Default { background-color: #D6D6D6; }
.Low { background-color: #0044FF; }

<table cellspacing="0" class="Container_Default">
<tr class="Header_Default">
<td colspan="6" style="width:35.29%;">First</td>
<td colspan="5" style="width:29.41%;">Second</td>
<td colspan="6" style="width:35.29%;">Third</td>
</tr>
<tr>
	<td class="Low"></td>
	<td class="Low"></td>
	<td class="Low"></td>
	<td class="Low"></td>
	<td colspan="13"></td>
</tr>
<tr class="test">
	<td style="width:5.88%;">&nbsp;</td><td style="width:5.88%;">&nbsp;</td>
	<td style="width:5.88%;">&nbsp;</td><td style="width:5.88%;">&nbsp;</td>
	<td style="width:5.88%;">&nbsp;</td><td style="width:5.88%;">&nbsp;</td>
	<td style="width:5.88%;">&nbsp;</td><td style="width:5.88%;">&nbsp;</td>
	<td style="width:5.88%;">&nbsp;</td><td style="width:5.88%;">&nbsp;</td>
	<td style="width:5.88%;">&nbsp;</td><td style="width:5.88%;">&nbsp;</td>
	<td style="width:5.88%;">&nbsp;</td><td style="width:5.88%;">&nbsp;</td>
	<td style="width:5.88%;">&nbsp;</td><td style="width:5.88%;">&nbsp;</td>
	<td style="width:5.88%;">&nbsp;</td>
</tr>
</table>
With FF, the table was displayed as I expected. But with IE (6 and 7) I encountered the following problems:

1) The third header column is slightly wider than the first (difference of 3-4 pixels), although I expected them to have the same width. When testing with more columns, the difference became larger.

2) The height of the empty cells (and of the second row in this case) is slightly lower than the height of cells with text. This might be a problem in case I'll want to place another table with a similar rows height next to this one.
This can be solved by filling the cells with &nbsp;, but I'm hoping there is another alternative, because my table might include thousands of cells and I don't want to make the page heavier by filling all of them with blanks.

Thanks,
Amit