selectbox problem

Hej Jeg er lige lidt i tvivl om dette er et javascript eller php problem. Men er der nogen der kan sige mig hvorfor den kun submitter fornavnet i nedenstående kode?

mvh gf

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script language="javascript" type="text/javascript">
function moveFromTo(from,to) {
  fromElm = document.getElementById(from);
    toElm = document.getElementById(to);
    var sletArr = new Array();
    while (fromElm.selectedIndex != -1) {
        toElm.options[toElm.length] = new Option(fromElm.options[fromElm.selectedIndex].text,fromElm.options[fromElm.selectedIndex].value);
        fromElm.options[fromElm.selectedIndex] = null;
  }
}

</script>
</head>

<body>
<form action="" method="post">
                <select multiple id="elever" style="height:200px;width:125px">
                  <option value=Peter Jensen>Peter Jensen</option>
                  <option value=Lars Kristensen>Lars Kristensen</option>
                </select>
               
                <input type="button" value=">>" onclick="moveFromTo('elever','syge');">
                <input type="button" value="<<" onclick="moveFromTo('syge','elever');">
                               
                <select name="sygeelever" multiple style="height:200px;width:100px" id="syge">
                </select>
               
                <input type="submit" name="Submit" value="Submit" />
                <?php
                if(isset($_POST["Submit"])) {
                echo $_POST["sygeelever"];
                  }
                ?>
        </form>
</body>
</html>