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How to get a checkbox list using javascript?

 
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Hi folks!

I'm developing a web application and there is an html form which contains a table with four columns. At the first column, I put checkboxes which allow the user remove the items specified on the second column. Moreover, each item may contain more than one subitem. So, at the third column I put checkboxes which allow the user remove the subitems specified on the forth column.

The first column checkboxes are named as "removeItem".
The third column checkboxes are names as "removeItem" + index of the item + "SubItem".

If the user check the checkbox of the first column, all subitems checkboxes related with the selected checkbox item must be checked.

The problem is that I don't know how to obtain the checkboxes of the third column when the first column checkbox is checked.

Someonde knows an solution for this problem?

Thanks!
Jo´┐Żo Cunha

PS:
I writed an javascript using the document.getElement() method, but it didn't wotk. It follows the code:

function selectItem(itemIndex) {
var items = document.teamForm.removeItem;
var subItems = document.getElementById("removeItem" + itemIndex + "SubItem");
if (items.length > 0) {
if (teamMember[teamMemberIndex].checked) {
checkAll(teamMemberRoles);
}
else {
clearAll(teamMemberRoles);
}
}
else {
if (teamMember.checked) {
checkAll(teamMemberRoles);
}
else {
clearAll(teamMemberRoles);
}
}
}

The methods checkAll and clearAll check and uncheck, respectively, all the checkboxes from a list
 
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