一个简单的智能感知效果

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
  <script src="jquery-1.1.2.js"/>
<script language="javascript">
  var rowint = 0;
  function doclick()
  {
   if(event.keyCode == 40 )
   {
    if(document.all("hidContent").value == ""){document.all("hidContent").value=document.all("txtContent").value;}
    if(rowint>0)
    { tabContent.rows[rowint-1].style.background="";}
    if(rowint<tabContent.rows.length)
    {
     tabContent.rows[rowint].style.background="#eeeeee";
     document.all("txtContent").value = tabContent.rows[rowint].innerText;
    }
    if(rowint==tabContent.rows.length)
    {
     document.all("txtContent").value=document.all("hidContent").value;
     tabContent.rows[rowint-1].style.background="";
     rowint = -1;
    }
    rowint ++;
   }
   else if(event.keyCode == 38)
   {
    if(rowint>1)
    {
     rowint --;
     tabContent.rows[rowint-1].style.background="#eeeeee";
     document.all("txtContent").value = tabContent.rows[rowint-1].innerText;
     if(rowint>0) { tabContent.rows[rowint].style.background="";}
    }
   }
  }
   function changeContent(obj)
    {
        if(obj.value != "")
        {//生成所需要的table
            var oml = $.ajax({url:"getContentByValue.aspx?rnd="+Math.random()+"&tmp="+obj.value,saync:false}).responseText;
            if(oml != "")
            {document.all("divFilteContent").innerHTML = oml;}
            else
            {document.all("divFilteContent").innerHTML ="";return;}
        }
    }
</script>

</HEAD>