如何使这段文字交替滚动? <SCRIPT language=JavaScript>
<!--
var mess1="";var mess2= "欢迎光临!"
document.write( )
day = new Date( )
hr = day.getHours( )
if (( hr >= 0 ) && (hr <= 4 ))
mess1="深夜了! "
if (( hr >= 4 ) && (hr < 7))
mess1="清晨好! "
if (( hr >= 7 ) && (hr < 12))
mess1="早上好,"
if (( hr >= 12) && (hr <= 13))
mess1="下班了"
if (( hr >= 13) && (hr <= 17))
mess1="下午好!"
if (( hr >= 17) && (hr <= 18))
mess1="下班了,"
if ((hr >= 18) && (hr <= 19))
mess1="休息时间,"
if ((hr >= 19) && (hr <= 23))
mess1="晚上黄金上网时间,"
document.write("<marquee>"+mess1+"</marquee>")
document.write("<marquee>"+mess2+"</marquee>")
document.write( )
//--->
</SCRIPT>
<!--
var mess1="";var mess2= "欢迎光临!"
document.write( )
day = new Date( )
hr = day.getHours( )
if (( hr >= 0 ) && (hr <= 4 ))
mess1="深夜了! "
if (( hr >= 4 ) && (hr < 7))
mess1="清晨好! "
if (( hr >= 7 ) && (hr < 12))
mess1="早上好,"
if (( hr >= 12) && (hr <= 13))
mess1="下班了"
if (( hr >= 13) && (hr <= 17))
mess1="下午好!"
if (( hr >= 17) && (hr <= 18))
mess1="下班了,"
if ((hr >= 18) && (hr <= 19))
mess1="休息时间,"
if ((hr >= 19) && (hr <= 23))
mess1="晚上黄金上网时间,"
document.write("<marquee>"+mess1+"</marquee>")
document.write("<marquee>"+mess2+"</marquee>")
document.write( )
//--->
</SCRIPT>
document.write("<marquee behavior="alternate">"+mess2+"</marquee>")
总是报错缺少“)”
可是document.write("<marquee>"+mess2+"</marquee>")的时候都不报错啊
document.write("<marquee behavior=\"alternate\">"+mess2+"</marquee>")