Probleme de banniere

Bonjour,
J'aimerais que ma bannière soit comme ça :
http://img338.imageshack.us/img338/2746/bannierem.jpg

Et moi j'ai:
http://img339.imageshack.us/img339/3649/bugbanniere.jpg



<table width="100%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td width="50%"><img src="../images/Man_Reading_470.jpg" width="470" height="150" /></td>
<td width="50%" class="header_green"><em>. . . providing the right learning in the correct format, at the right time.</em></td>
</tr>
</table>

.header_green {
background-color: #66BC29;
color: #FFFFFF;
font-family: Arial,Helvetica,sans-serif;
font-size: 12px;
font-style: normal;
font-weight: bold;
text-align: left;
text-indent: 18px;
vertical-align: middle;
white-space: normal;
}

Merci d'avance pour votre aide.