function printcss(){
date=new Date();
myHour=date.getHours();
if(7 <= myHour && myHour < 16){
document.write('');
}
else if(16 <= myHour && myHour < 18){
document.write('');
}
else if(18 <= myHour && myHour < 20){
document.write('');
}
else if(20 <= myHour && myHour < 23){
document.write('');
}
else if(23 <= myHour && myHour < 24){
document.write('');
}
else if(4 <= myHour && myHour < 7){
document.write('');
}
else{
document.write('');
}
}