#mainnav li#mainnav-home a {width:95px; background-image:url(../images/mainnav/mainnav-home-sp.jpg); width:96px; }
#mainnav li#mainnav-company a {width:159px; background-image:url(../images/mainnav/mainnav-company-overview-sp.jpg);} 
#mainnav li#mainnav-operations a {width:132px; background-image:url(../images/mainnav/mainnav-operations-sp.jpg);} 
#mainnav li#mainnav-projects a {width:115px; background-image:url(../images/mainnav/mainnav-projects-sp.jpg);} 
#mainnav li#mainnav-exploration a {width:130px; background-image:url(../images/mainnav/mainnav-exploration-sp.jpg);} 
#mainnav li#mainnav-investors a {width:156px; background-image:url(../images/mainnav/mainnav-investors-sp.jpg);} 
#mainnav li#mainnav-responsibility a {width:306px; background-image:url(../images/mainnav/mainnav-responsibility-sp.jpg); width:181px;}