/****** main navigation ****************************************************/	
	
ul#main-navigation			{height:35px;background:#070D12 url(bg-main-navigation.jpg); margin-left:3px; margin-right:3px;}	
ul#main-navigation li		{display:inline;float:right;}
ul#main-navigation a		{display:block;height:35px;float:left;text-indent:-9999px;}

a#nav-trangchu				{background:url(trangchu.jpg) no-repeat 0 0;width:122px;}
a#nav-gioithieu				{background:url(gioithieu.jpg) no-repeat 0 0;width:122px;}
a#nav-thuvien				{background:url(thuvien.jpg) no-repeat 0 0;width:122px;}
a#nav-dichvu				{background:url(dichvu.jpg) no-repeat 0 0;width:122px;}
a#nav-phanmem				{background:url(phanmem.jpg) no-repeat 0 0;width:122px;}
a#nav-hethongmang			{background:url(hethongmang.jpg) no-repeat 0 0;width:150px;}

ul#main-navigation li a.here, ul#main-navigation li a:hover	{background-position:0 -82px;}