.background_L {  background-image: url(images_ground/BG_gradation_L.gif); background-repeat: repeat-y; background-position: right 100%; background-color: #CCCCCC; clip:  rect(   )}
.background_R { background-color: #CCCCCC; background-image: url(images_ground/BG_gradation_R.gif); background-repeat: repeat-y; background-position: left 100%}
.background {  background-color: #CCCCCC; background-image: url(images_ground/BG_gradation.gif); background-repeat: repeat-y; background-position: center 100%}