.mainNav { position: absolute; top: 50px; right: 10px; width: 560px; height: 43px; }
.mainNav div { float: left; }
.mainNav1 { background-image: url(images/mainNav01_Off.png); width: 140px; height: 43px; }
.mainNav1:hover, .mainNav1:active { background-image: url(images/mainNav01_On.png); width: 140px; height: 43px; }
.mainNav2 { background-image: url(images/mainNav02_Off.png); width: 140px; height: 43px; }
.mainNav2:hover, .mainNav2:active { background-image: url(images/mainNav02_On.png); width: 140px; height: 43px; }
.mainNav3 { background-image: url(images/mainNav03_Off.png); width: 140px; height: 43px; }
.mainNav3:hover, .mainNav3:active { background-image: url(images/mainNav03_On.png); width: 140px; height: 43px; }
.mainNav4 { background-image: url(images/mainNav04_Off.png); width: 140px; height: 43px; }
.mainNav4:hover, .mainNav4:active { background-image: url(images/mainNav04_On.png); width: 140px; height: 43px; }