st = "<br>"+st;
var colsPerLine=30;//规定每行半角字符数 640*480时为30
if (screen.width>600) colsPerLine=37
if (screen.width>800) colsPerLine=48
//把自动换行变成硬换行
var lastBR=0;
for (i=0;i<st.length;i++)
{
if (i == st.indexOf("<br>",lastBR+3))
{
lastBR=i;
i+=3;
continue;
}
var s = st.substr(lastBR,i-lastBR);
if (reallen(s)>colsPerLine)
{
st = st.substr(0,i-1)+"<br>"+st.substr(i-1);
lastBR=i-1;
i+=3;
}
}
var l = st.split("<br>").length;
j=-1;
for (i=0;i<(l+1)/2;i++)
j=st.indexOf("<br>",j+1);
td1.innerHTML = st.substr(4,j)
td2.innerHTML = st.substr(j+4)
//-->
</SCRIPT>
<body>
<TABLE width=90% align=center>
<TR>
<TD width=50% id=td1 valign=top></TD>
<TD width=50% id=td2 valign=top></TD>
</TR>
</TABLE>
</body>
</html>