#nav  { position:absolute; top:4px; left:4px; width:150px; height:232px; z-index:2; }
#nav_1  { position:absolute; top:154px; left:152px; width:140px; height:60px; z-index:2; }
#nav_2  { position:absolute; top:174px; left:152px; width:140px; height:108px; z-index:2; }
#nav_4  { position:absolute; top:214px; left:152px; width:140px; height:40px; z-index:2; }

#nav_2_1  { position:absolute; top:174px; left:284px; width:140px; height:104px; z-index:3; }
#nav_2_2  { position:absolute; top:218px; left:282px; width:140px; height:220px; z-index:3; }
#nav_2_3  { position:absolute; top:262px; left:282px; width:140px; height:80px; z-index:3; }