str="<script language=javascript>"+
       "function sub(){"+
       "if (form.search.value == \"\")"+
       "  alert(\"请输入搜索的关键字！\");"+
       "else"+
       "  form.submit();"+
       "}"+
"</script>"+
"<table width=780 height=50 border=0 cellpadding=0 bgcolor=#ffffff cellspacing=0 align=center>"+
  "<tr>"+ 
    "<td width=465 height=50><img src=/pic/logo.gif></td>"+
    "<td align=right style='padding-top:15px' width=160>"+
    "<form name=form action='search.asp' method=post>"+
    "<input type=text name=search style='width:100' class=tex>"+
    "&nbsp;<a onclick=sub() style='CURSOR:hand' class=link><b>search</b></a></form></td>"+
    "<td align=right valign=middle>"+
    "<a href=/bbs/index.asp class=link><b>>> 进入BBS</b></a>&nbsp;"+
    "</td>"+
  "</tr>"+
  "</table>"
 document.write(str)