function checkforminfox(){
  if (document.frm_searchinfo.keyword.value==""){
      alert("ÇëÊäÈë¹Ø¼ü×Ö!");
      document.frm_searchinfo.keyword.focus();
      return false;
      }
  else
      return true;
}

str="<table border=0 align=center cellpadding=0 cellspacing=0><form name=frm_searchinfo method=post action=/info/searchin.asp onsubmit='javascript:return checkforminfox();'><tr><td align=center>¹Ø¼ü×Ö:<input name=keyword class=p9  size=12>&nbsp;&nbsp;<input type=image name=Submit src=/images/mbs.gif align=absmiddle><table width=100% border=0 cellspacing=0 cellpadding=0><tr><td height=10></td></tr></table></td></tr></form></table>"

document.write(str)