quítale la parte del código que dice
osea, se queda así:
Código html:
Ver original<div id="menu"><a href="javascript:;" target="_top" onclick="MM_nbGroup('down','group1','boton1','Images/boton_1_off.jpg',1)" onmouseover="MM_nbGroup('over','boton1','Images/boton_1_on.jpg','',1)" onmouseout="MM_nbGroup('out')"><img src="Images/boton_1_off.jpg" alt="" name="boton1" width="136" height="45" border="0" id="boton1" onload="" /></a><a href="javascript:;" target="_top" onclick="MM_nbGroup('down','group1','boton2','Images/boton_2_off.jpg',1)" onmouseover="MM_nbGroup('over','boton2','Images/boton_2_on.jpg','',1)" onmouseout="MM_nbGroup('out')"><img src="Images/boton_2_off.jpg" alt="" name="boton2" width="136" height="45" border="0" id="boton2" onload="" /></a><a href="javascript:;" target="_top" onclick="MM_nbGroup('down','group1','boton3','Images/boton_3_off.jpg',1)" onmouseover="MM_nbGroup('over','boton3','Images/boton_3_on.jpg','',1)" onmouseout="MM_nbGroup('out')"><img src="Images/boton_3_off.jpg" alt="" name="boton3" width="136" height="45" border="0" id="boton3" onload="" /></a><a href="javascript:;" target="_top" onclick="MM_nbGroup('down','group1','boton4','Images/boton_4_off.jpg',1)" onmouseover="MM_nbGroup('over','boton4','Images/boton_4_on.jpg','',1)" onmouseout="MM_nbGroup('out')"><img src="Images/boton_4_off.jpg" alt="" name="boton4" width="136" height="45" border="0" id="boton4" onload="" /></a><a href="javascript:;" target="_top" onclick="MM_nbGroup('down','group1','boton5','Images/boton_5_off.jpg',1)" onmouseover="MM_nbGroup('over','boton5','Images/boton_5_on.jpg','',1)" onmouseout="MM_nbGroup('out')"><img src="Images/boton_5_off.jpg" alt="" name="boton5" width="136" height="45" border="0" id="boton5" /></a></div>
además, no se porqué tienes ese enlace vacío.