.gradient-tb(@top, @bottom){
background: @top; /* Old browsers */
background: -moz-linear-gradient(top, @top 10%, @bottom 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(10%,@top,), color-stop(100%,@bottom)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, @top, 10%,@bottom 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, @top, 10%,@bottom 100%); /* Opera11.10+ */
background: -ms-linear-gradient(top, @top 10%,@bottom 100%); /* IE10+ */
filter: ~"progid:DXImageTransform.Microsoft.gradient( startColorstr='@top', endColorstr='@bottom',GradientType=0 )"; /* IE6-9 */
background: linear-gradient(top, @top 10%,@bottom 100%); /* W3C */
}