js实现带圆角的多级下拉菜单效果【javascript】

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im_round_corners("top","main");
Who We Are
im_round_corners("top","sub"); Overview Mission & Goals History Management Working at Tyco Press Center Board of Directors  
im_round_corners("top","sub");  Overview  Electronics  Fire & Security  Healthcare  Plastics & Adhesives  Engineered Producs  Tyco Worldwide  im_round_corners("bottom","sub");
 Worldwide  
im_round_corners("top","sub");  Europe  Asia  US & Canada  Mexico  Australia  Middle East  im_round_corners("bottom","sub");
 Customers im_round_corners("bottom","sub");
Our Commitment
im_round_corners("top","sub"); Overview People & Values Governance Community Environmental im_round_corners("bottom","sub");
Our Business
im_round_corners("top","sub"); Overview Electronics Fire & Security Healthcare Plastics Engineered Producs Tyco Worldwide im_round_corners("bottom","sub");
Investors
im_round_corners("top","sub"); Overview Stock Quotes im_round_corners("bottom","sub");
 
im_round_corners("bottom","main");