//**
  Provides cross-browser css box shadows for Webkit, Gecko, and CSS3 standard
  arguments are color, horizontal offset, vertical offset, and blur

//**
  These defaults make the arguments optional for this mixin
  If you like, set different defaults in your project
  
!default_box_shadow_color     ||= #333
!default_box_shadow_h_offset  ||= 1px
!default_box_shadow_v_offset  ||= 1px
!default_box_shadow_blur      ||= 5px

=box-shadow(!color = !default_box_shadow_color, !hoff = !default_box_shadow_h_offset, !voff = !default_box_shadow_v_offset, !blur = !default_box_shadow_blur)
  /* Webkit (Safari, Chrome) */
  -webkit-box-shadow= !color !hoff !voff !blur
  /* Gecko (Firefox, Camino) */
  -moz-box-shadow= !color !hoff !voff !blur
  /* CSS3 */
  box-shadow= !color !hoff !voff !blur