[monolithed]

HelpeR Не нужно такому учить

<script type="text/javascript">
window.onload = function(){
    var table = document.getElementsByTagName('td');
    var input = document.getElementsByTagName('input');
    for(i=0; i<table.length; i++){
        (function(i){
            table[i].onclick = function(){
                 input[i].value = table[i].innerHTML;
            };  
        })(i);
    }
};
</script>

<style type="text/css">
td {border-collapse:collapse; border: 1px solid #DDD; padding: 0px 5px; width: 136px;}
input {width: 148px;}
</style>

<table border="0">
    <tr>
        <td>td1</td>
        <td>td2</td>
        <td>td3</td>
    </tr>
</table>

<input type="text" value="" />
<input type="text" value="" />
<input type="text" value="" />