function SetBgColor() { 
 dd=new Date()
 nowhours=dd.getHours()
 if (nowhours < 6 || nowhours >19) {
    document.bgColor = "#000000"
 }else if(nowhours < 12) {
    document.bgColor = "#ffDD33"
 }else if(nowhours < 17) {
    document.bgColor = "#e0ffff"
 }else {
    document.bgColor = "#9977aa"
 }	
 
}