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<head>
<title>Index</title>
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<body>
<div id="Layer1">
<div align="left">
<p align="center"><img src="http://www.forosdelweb.com/f4/inicio/logo2.jpg" alt="logo" width="60" height="60" /></p>
</div>
</div>
<div id="Layer2">
<div align="center">
<h1 class="Estilo3">Universidad Multitecnica Profesional </h1>
</div>
</div>
<div id="Layer3">
<div align="center"><img src="http://www.forosdelweb.com/Imagenes/1387072174_books.png" alt="logo" width="50" height="50" /></div>
</div>
<div id="Layer5">
<h1 class="Estilo8"><a href="http://www.forosdelweb.com/f4/Modulo materia/Mat-Cal.html">Calificacion</a></h1>
</div>
<div id="Layer6">
<div align="center"><img src="http://www.forosdelweb.com/Imagenes/la-seguridad-del-usuario--forma-la-mitad-del-cuerpo_318-32249.jpg" alt="alumno" width="50" height="50" /></div>
</div>
<div id="Layer7">
<h1 align="center" class="Estilo8">Alumno</h1>
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<div id="Layer9"><img src="http://www.forosdelweb.com/Imagenes/icono_profesor.png" alt="informacion" width="50" height="50" /></div>
<div id="Layer10">
<center>
<h2 class="Estilo8"> Información </h2>
</center>
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<div id="Layer11">
<div align="center"><img src="http://www.forosdelweb.com/Imagenes/usuario-escudo-simbolo-interfaz-para-la-seguridad_318-63497.jpg" alt="administracion" width="50" height="50" /></div>
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<div id="Layer12">
<center>
<h1 class="Estilo6"> Admnistración </h1>
</center>
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<div id="Layer13"><img src="http://2.bp.blogspot.com/-TFwGk-TiEB4/Ua-K70K3rcI/AAAAAAAAEdo/WYl9yIrfwdg/s1600/contacto.gif" alt="contacto" width="50" height="50"/></div>
<div id="Layer14">
<h1 class="Estilo5">
<center>
<span class="Estilo8"><a href="http://www.forosdelweb.com/f4/Contacto/Contacto.html">Contacto</a></span>
</center>
</h1>
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<div id="Layer17">
<form id="form1" method="post" action="">
<p>
<label>
<input type="button" value="Cerrar Seccion" onclick="cerrar()" />
</label>
</p>
</form>
</div>
<div id="Layer18">(<span class="Estilo7">UMP</span>)©</div>
<table width="296" border="0" cellpadding="0" cellspacing="1">
<!--DWLayoutTable-->
<tr>
<td width="294" height="466" valign="top"><p> </p>
<p> </p>
<p> </p>
<p> </p> <p> </p></td>
</tr>
<tr>
<td height="78"> </td>
</tr>
</table>
</body>
</html>
en esta parte es donde me gustaria para cuando el usuario desea salir