.grid960base15 {
 width: 960px;
 line-height: 15px;
 background: url(images/grid960base15.png) repeat-y;
}
.grid960base18 {
 width: 960px;
 line-height: 18px;
 background: url(images/grid960base18.png) repeat-y;
}
.grid960base30 {
 width: 960px;
 line-height: 30px;
 background: url(images/grid960base30.png) repeat-y;
}
.grid600base12 {
 width: 600px;
 line-height: 12px;
 background: url(images/grid600base12.png) repeat-y;
}
.grid600base16 {
 width: 600px;
 line-height: 16px;
 background: url(images/grid600base16.png) repeat-y;
}
.grid600base18 {
 width: 600px;
 line-height: 18px;
 background: url(images/grid600base18.png) repeat-y;
}