Div Alignment FireFox, IE7, IE6

Answer 1

Yeah, this is possible:

<table>
    <tr>
        <td></td>
        <td rowspan='2'></td>
    </tr>
    <tr>
        <td></td>
    </tr>
    <tr>
        <td colspan='2'></td>
    </tr>
</table>

I'm only kidding, of course.

Answer 2

You won't get equal heights for the 2 left DIVs combined and the right DIV. Unless ofcourse you specify those, or if the contents produce the same heights... But this shouldn't be a problem i think?

Update

<style type="text/css">
    #container {float:right;position:relative;}
    #left    {float:left;}
    #left_1  {float:left;}
    #left_2  {clear:left;float:left;}
    #right   {float:right;}
    #bottom  {float:left;clear:both;}
</style>

<div id="container">
    <div id="left">
        <div id="left_1">left 1</div>
        <div id="left_2">left 2</div>
    </div>

    <div id="right">right</div>

    <div id="bottom">bottom</div>
</div>