function baseColour ( ) {
      var today = new Date()

      if ( today.getDate() % 3 == 0 )
      {
      document.write('<style type="text/css">')
      document.write('H1 {color: rgb(30%,30%,40%);}')
      document.write('H2 {color: rgb(45%,45%,55%);}')
      document.write('H3 {color: rgb(60%,50%,70%);}')
      document.write('H4 {color: rgb(65%,60%,75%);}')
      document.write('H5 {color: rgb(70%,70%,75%);}')
      document.write('H1, H2, H3, H4, H5, H6 { background-color: rgb(100%,90%,100%);}')
      document.write('</style>')
      } else {
      if ( today.getDate() % 3 == 1 )
      {
      document.write('<style type="text/css">')
      document.write('H1 {color: rgb(40%,30%,30%);}')
      document.write('H2 {color: rgb(55%,45%,45%);}')
      document.write('H3 {color: rgb(70%,50%,60%);}')
      document.write('H4 {color: rgb(75%,60%,65%);}')
      document.write('H5 {color: rgb(75%,70%,70%);}')
      document.write('H1, H2, H3, H4, H5, H6 { background-color: rgb(90%,100%,100%); }')
      document.write('</style>')
      } }
  }