How to select multiple checkboxes with the same class but depending on which items have been selected

I have a table with multiple rows, in this table each row has it's checkbox and a text field (this text field contains class XXX, but is different per row, although sometimes two of more share the same class).

Now I want, when a user selects checkbox 1 (textfield has the class "A") and checkbox 5 (textfield has the class "B") and clicks the button "Select group", to select all other checkboxes which have the textfield with class "A" or class "B" in their row.

I was thinking of using $(this).closest but I don't know how jQuery really works, so could anyone point me out in the right direction?

Thanks in advance.

Edit some html: http://jsfiddle.net/hg4p6/1/

<table>
    <tr>
        <td>
            <input type='checkbox' id='chk1'>
        </td>
        <td>
            <input type='text' value='123' class='A'>
        </td>
    </tr>
    <tr>
        <td>
            <input type='checkbox' id='chk2'>
        </td>
        <td>
            <input type='text' value='518' class='C'>
        </td>
    </tr>
    <tr>
        <td&开发者_C百科gt;
            <input type='checkbox' id='chk3'>
        </td>
        <td>
            <input type='text' value='321' class='B'>
        </td>
    </tr>
    <tr>
        <td>
            <input type='checkbox' id='chk4'>
        </td>
        <td>
            <input type='text' value='567' class='A'>
        </td>
    </tr>
    <tr>
        <td>
            <input type='checkbox' id='chk5'>
        </td>
        <td>
            <input type='text' value='971' class='B'>
        </td>
    </tr>
    <tr>
        <td colspan='2'><input type='button' value='Select same classes' onclick='Funcion'>
        </td>
    </tr> 
</table>

So basically, when you select the first checkbox, it should select the 4th aswell. And if you select the 3rd checkbox, it should select the 5th aswell.

Here you go

Working demo

$(function(){
    $("#selectAll").click(function(){
        var className, $table = $("table");
        $table.find("input:checked")
        .each(function(){
            className = $(this).closest("tr").find("input:text").attr('class');
            $table.find("input[type:text]."+className)
            .closest("tr").find("input:checkbox").attr('checked', true);
        });
    });
});

My solution:

http://jsfiddle.net/hg4p6/24/

$(function() {
    $('#clickme').click(function() {
        $('input:checked').each(function() {
            var c = ($(this).parent().next().children("input:text").attr("class"));
            $("input:text").filter("."+c).parent().prev().children("input:checkbox").prop("checked",true);
        });
    });
});

$(":button").click(function(){


$("input[type='checkbox']").each(function(){

var is = $(this).closest("td").next("td").children("input").is(".B,.A");
    if(is)
        $(this).prop("checked",true);

});
});

http://jsfiddle.net/hg4p6/16/