function showHello() {
	var welcomestring;
	var d = new Date();	
	h = d.getHours();
	if(h<6)
		welcomestring="凌晨好";
	else if (h<9)
		welcomestring="早上好";
	else if (h<12)
		welcomestring="上午好";
	else if (h<14)
		welcomestring="中午好";
	else if (h<17)
		welcomestring="下午好";
	else if (h<19)
		welcomestring="傍晚好";
	else if (h<22)
		welcomestring="晚上好";
	else
		welcomestring="夜里好";
	document.write(welcomestring);
}