var bgIMG; 
 var time=" " ;
 now=new Date() 
 var hour=now.getHours() 
 if (5<=hour && hour<7)  bgIMG = "background_cloud_sunset" 
 else if (7<=hour && hour<17) bgIMG = "background_cloud_day" 
 else if (17<=hour && hour<19) bgIMG = "background_cloud_sunset" 
 else bgIMG = "background_cloud_night" 
 document.writeln('<STYLE TYPE="text/css">'); 
 document.writeln('BODY {background-image: url(images/backgrounds/',bgIMG,'.gif); background-repeat:repeat-x; background-color:white; font-family:Arial,Helvetica,Verdana,sans-serif; font-size:12px;}'); 
 document.writeln('</STYLE>')