Different Styles Pending the Time of Day

<script>
<!--
function getStylesheet() {
      var currentTime = new Date().getHours();
      if (0 <= currentTime&&currentTime < 5) {
       document.write("<link rel='stylesheet' href='night.css' type='text/css'>");
      }
      if (5 <= currentTime&&currentTime < 11) {
       document.write("<link rel='stylesheet' href='morning.css' type='text/css'>");
      }
      if (11 <= currentTime&&currentTime < 16) {
       document.write("<link rel='stylesheet' href='day.css' type='text/css'>");
      }
      if (16 <= currentTime&&currentTime < 22) {
       document.write("<link rel='stylesheet' href='evening.css' type='text/css'>");
      }
      if (22 <= currentTime&&currentTime <= 24) {
       document.write("<link rel='stylesheet' href='night.css' type='text/css'>");
      }
}

getStylesheet();
-->
</script>

<noscript><link href="main.css" rel="stylesheet"></noscript>