Need Firefox/Safari fix: text floats over image

programming web dev
1 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Bottom align text</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type"/>
<style type="text/css" media="screen">
<!--
p.margin0padding0 {
    margin:0;
    padding:0;
}
.mentorWrapper {
    width:375px;
    height:127px;
}
.imageFixedPos {
    float:left;
    width:122px;
    height:127px;
    display:block;
}
.stackedText {
    width:253px;
    height:100%;
    position:relative;
}
.stackedText div {
    position:absolute;
    bottom:0;
    left:0;
}
-->
</style>
</head>
<body>
<div class="mentorWrapper"> <img src="images/th_head.jpg" alt="John Doe" class="imageFixedPos" width="122" height="127" border="0" />
  <div class="stackedText">
    <div>
      <p class="margin0padding0"><a style="margin-left:20px;" href="#">John Doe</a><br />
        <span style="font-style:italic;margin-left:40px;">Motivational Speaker</span></p>
    </div>
  </div>
</div>

<div class="mentorWrapper"> <img src="images/th_head.jpg" alt="Sally Jane" class="imageFixedPos" width="122" height="127" border="0"/>
  <div class="stackedText">
    <div>
      <p class="margin0padding0"><a style="margin-left:20px;" href="#">Sally Jane</a><br />
        <span style="font-style:italic;margin-left:40px;">News Anchor</span></p>
    </div>
  </div>
</div>
</body>
</html>

Looks fine in IE 7, but the text will float over the image in Firefox 3.