How to stop IE &ldquo;moving&rdquo; text around within a <div>?

#greenback { position: relative;
width: 800px ;
height: 250px ;
background-color: #7EBB11 ;
border: 3px solid #112D82 ;
}

#picright { position: relative ;
float: right;
display: block;
margin-top: 11px;
margin-right: 11px;
margin-bottom: 11px;
max-width: 50%;
max-height: 218px;
border: 3px solid white;
vertical-align: middle ;
}

#greenback>#billboard {/*display:table for Mozilla and Opera*/
display: table ;
position: static ;
}

#billboard  { /* for IE*/
width: 45% ;
height: 99% ;
background-color: #7EBB11 ;
font-family: Optima, Calibri, Candara, Century-Gothic,
Arial, sans-serif;
font-size: 160% ;
color: #ffffff ;
position: relative;
border: 2px solid blue;
}

#billboard div { /*for IE*/
position: absolute;
float: left ;
top: 50%;
}

#billboard>div { /*for Mozilla and Opera*/
display: table-cell ;
vertical-align: middle ;
position: static;
}

#billboard div div {
position: relative ;
top: -50%;
}

/* Hides from IE5-mac */
* html .billboard {height: 1%;}
/* End hide from IE5-mac */

<div id="greenback">
<img src="kids.jpg" alt="kids" id="picright" />
<div id="billboard"><div><div><p>We help businesses,<br>communities and nature<br>take better care<br>of each other.</p>
</div></div></div></div>

<style>

#greenback {
    width: 800px ;
    height: 250px ;
    background-color: #7EBB11 ;
    border: 3px solid #112D82 ;
}

#picright {
    float: right;
    display: block;
    margin: 11px 11px 11px 20px;
    width: 50%;
    height: 218px;
    border: 3px solid white;
}

#billboard  {
    width: 45% ;
    height: 99% ;
    border: 2px solid blue;
    float: right;
}

#billboard p {
    text-align: center;
    margin: 0;
    border: 1px solid red;
    margin-top: 50px;
    font-family: Optima, Calibri, Candara, Century-Gothic, Arial, sans-serif;
    font-size: 160% ;
    color: #ffffff ;
}
</style>

<div id="greenback">
    <img src="kids.jpg" alt="kids" id="picright" />
    <div id="billboard"><p>We help businesses,<br>communities and nature<br>take better care<br>of each other.</p></div>
</div>