I have a box in a box as everybody does. I want the left column to be streched to full height. 
So the problem is that the leftcolumn don't stretch to the full height of the contentbox.

here is the HTML

```
<div id="realBody">
    <div id="bigBox">
        <div id="contentBox">
            <div id="rightColumn" style="height:600px;">

            </div>

            <div id="leftColumn">

            </div>
        </div>
    </div>
</div>

```

CSS

```
@CHARSET "UTF-8";

body                {
                    height: 100%;
                    margin:0px;
                    overflow:hidden;
                    background:url(../image/bg.jpg);
                    background-repeat:repeat-x;
                    background-position:center;
                    background-color:black;
                    font-family:"Lucida Sans Unicode", "Lucida Grande", sans-serif;
                    }

 #bigBox                {
                        width:1000px;
                        height:auto;
                        overflow:auto;
                        margin:40px auto 20px auto;
                        padding:10px;
                        }

#realBody           {
                    position:absolute;
                    z-index: 5;             
                    overflow:auto;
                    height:100%;width:100%; 
                    }

#contentBox         {
                    border-top:solid 10px #e1e1e1;
                    border-bottom:solid 10px #d1d1d1;
                    margin-top:10px;
                    background-color:white; 
                    overflow:auto;
                    height: auto;
                    box-shadow:0px 0px 20px black;
                    }

#leftColumn         {
                    position:relative;
                    width:300px;
                    padding:10px;
                    height:100%;
                    box-shadow:0px 0px 20px black;
                    background-color:#e3e3e3;
                    z-index:6;
                    }

#rightColumn        {
                    position:relative;
                    float:right;
                    width:650px;
                    padding:10px;
                    z-index:4;
                    }

```