求传递参数问题

[boarduck]

function SelectFirst()
{
var grid = document.getElementById('dgList');
var flag = grid.rows[0].cells[0].children[1].checked;
}
function SelectTwo()
{
var grid = document.getElementById('dgList');
var flag = grid.rows[0].cells[0].children[2].checked;
}
...
function SelectN()
...

children里是1到n个checkbox,每个都有事件，因为不想写太多js。
请问如何用参数传进去取得对象，代码效果如下
function SelectAll(num)
{
var grid = document.getElementById('dgList');
var flag = grid.rows[0].cells[0].children[num].checked;
}
<input type=checkbox onclick="SelectAll(1)">

[mingxuan3000]

1
<input type=checkbox onclick="SelectAll(this)">
function SelectAll(aaa)
{

var flag = aaa.checked;
}

2
function SelectAll(num)
{
var grid = document.getElementById('dgList');
var flag = eavl("grid.rows[0].cells[0].children["+num+"]").checked;
}
<input type=checkbox onclick="SelectAll(1)">

[mingxuan3000]

2
function SelectAll(num)
{
var grid = document.getElementById('dgList');
var flag = eval("grid.rows[0].cells[0].children["+num+"]").checked;
}
<input type=checkbox onclick="SelectAll(1)">

[boarduck]

thanks a lot