function checkforminfox(){
  if (document.frm_searchinfo.key.value==""){
      alert("ÇëÊäÈë¹Ø¼ü×Ö!");
      document.frm_searchinfo.key.focus();
      return false;
      }
  else
      return true;
}
str="<table width=100% border=0 align=center cellpadding=0 cellspacing=0><form name=frm_searchinfo method=post action=search.asp onsubmit='javascript:return checkforminfox();' style=margin:0px;><tr><td align=right><input name=key size=20>&nbsp;&nbsp;<img src='/images/search.gif' width='53' height='20' align='absmiddle' onclick='JavaScript:document.frm_searchinfo.submit();' style='cursor:hand;'></td></tr></form></table>"

document.write(str)