<script language="JavaScript"> day=new Date() //..get the date x=day.getHours() //..get the hour if(x>=0 && x<4) { document.write('<style type="text/css">body{background: white url(1st.jpg); color: black}"></style>') } else if(x>=4 && x<12) { document.write('<style type="text/css">body{background: white url(2nd.jpg); color: black}</style>') } else if(x>=12 && x<18) { document.write('<style type="text/css">body{background: white url(3rd.jpg); color: black}</style>') } else if (x>=18 && x<24) { document.write('<style type="text/css">body{background: white url(4th.jpg); color: black}</style>') } </script>