ul.mainSubMenu, 

ul.mainSubMenu ul 
{ display: block; margin: 0; padding: 0; } 

ul.mainSubMenu li 
{ margin: 0; display: inline; position: relative; } 

ul.mainSubMenu li ul 
{ display: block; position: absolute; z-index: 1000; visibility: hidden; } 

ul.mainSubMenu li ul li 
{ margin: 0; padding: 0; display: block; list-style: none; } 

ul.mainSubMenu li a 
{ display: inline; } 

ul.mainSubMenu li ul li a 
{ display: block; }