problems with nivo slider light and menu dropdown

Hi I have a problem with t开发者_开发知识库he nivo slider light in wordpress and menu dropdown

When I try to down to the other "section" the menu dissapear

This is a problem with z-index or something?? Very thanks

The link is the above

http://www.pymedia.cl/st/

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It seems like the issue is related to CSS of the <span> tags inside the <a> tags of your menu's <li>. Could you try just removing those spans temporarily or the CSS applied to them?