.mainbg {  font-family: Arial, Helvetica, sans-serif; font-size: 10px; background-image: url(imgs/bgmain.jpg); background-repeat: no-repeat; background-position: center center; background-attachment: fixed}
.bgmain {  font-family: Arial, Helvetica, sans-serif; font-size: 10px; background-attachment: fixed; background-image: url(imgs/bgmain.jpg); background-repeat: no-repeat; background-position: center top}
.bgmain {  }