Php从文件读取错误

我有这个:

     echo '

     <div id="headlineatas">
     <br>
     <div id="adsground">
     <br><br><br>
     <p align="center"><span style="font-size: 44px;"> Language Selection </span></p>
<table height="400" width="1024">
        <tr>
        <td>

        <center><a href="index.php?lang=en" id="language1">
    <img title="English" src="/img/language_selection/us_first.png" onmouseover="this.src=''/img/language_selection/us.png"'' onmouseout="this.src=''/img/language_selection/us_first.png"'' />
</a>
            </center>
        </td>
        <td>
        <center><a href="index.php?lang=ro" id="language2">
    <img title="Romanian" src="/img/language_selection/ro_first.png" onmouseover="this.src=''/img/language_selection/ro.png"'' onmouseout="this.src=''/img/language_selection/ro_first.png"'' />
</a>

        </center>
        </td>
        </tr>
        </table>

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

我有一个错误，如:syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ',' or ';' in，但我不明白是什么问题，或者当我修改它时，鼠标在代码上不起作用。我哪里做错了?