好代码

function ftest()
{
var kk=0;
var kk2=0;
kk=document.all("aa").offsetLeft;
kk2=document.all("aa").offsetTop;
document.all("Layer1").style.top=kk2+document.all("aa").offsetHeight;
document.all("Layer1").style.left=kk;
document.all("Layer1").style.width=document.getElementById("aa").style.width;
document.all("Layer1").style.visibility = "visible";
document.getElementById("caidn").rows(0).cells(0).innerHTML=document.getElementById("aa").value;
}
function fClose()
{
document.all("Layer1").style.visibility = "hidden";
}
function trOnMouseOver(trid) {
document.all("caidn").bgColor="#cccc99";
//alert(document.getElementById("caidn").rows(0).cells(0).innerHTML);
//alert(document.all("caidn").rows(0).cells(0).innerHTML);
document.getElementById("aa").value=document.getElementById("caidn").rows(trid).cells(0).innerText;
fClose();
}

function trOnMouseOver2(trid) {
alert(document.getElementById("ppp").rows(trid).cells(0).innerText);
//alert(document.getElementById("ppp").rows(0).cells(0).innerText);
}

<form name="form1" method="post" action="">
  <input name="aa" type="text" id="aa" size="20" style="width:100" onKeyUp="ftest();">

  <input type="button" name="test" value="按钮" onClick="ftest();">
  <input type="button" name="test2" value="按钮2" onClick="trOnMouseOver();">
</form>

<div id="Layer1" style="position:absolute; width:200px; height:115px; z-index:1; top: 260px; left: 22px; background-color: #FFFFFF; layer-background-color: #FFFFFF; border: 1px none #000000; visibility: hidden;">
  <table border="0" cellpadding="0" cellspacing="0" id="caidn">
    <tr onClick="trOnMouseOver(this.rowIndex);" onmouseout="this.style.backgroundColor='ffffff'"
        onmouseover="this.style.backgroundColor='ffc080'">
      <td width="50" height="22">AA</td>  <td width="50" height="22">BB</td>
    </tr>
  <tr onClick="trOnMouseOver(this.rowIndex);" onmouseout="this.style.backgroundColor='ffffff'"
        onmouseover="this.style.backgroundColor='ffc080'">
      <td width="50" height="22">CC</td>  <td width="50" height="22">DD</td>
    </tr>
</table>

</div>
<table border="1" cellpadding="0" cellspacing="0" id="ppp">
  <tr onClick="trOnMouseOver2(this.rowIndex);">
      <td width="50" height="22">AA</td>  <td width="50" height="22">BB</td>
    </tr>
  <tr onClick="trOnMouseOver2(this.rowIndex);">
      <td width="50" height="22">CC</td>  <td width="50" height="22">DD</td>
    </tr>
</table>