Access Row Data From A Table Within Tables?

I have a table within a table, that is to say the table is embedded in a <tr> tag in another table and would like to extract row and cell data to make an ajax call. The table in question has several input fields and a submit button on each row. While I can find the table where the submit came from and can get the data from the <td> elements which contain data i.e.<? echo AsOfDate; ?>, I can't find the correct syntax to retrieve the data from the input fields in that same row. Can someone give me the correct syntax to retrieve the input data?

var AssetTbl = document.getElementsByTagName('table');
for (i =0; i< AssetTbl.length; i++)
{
if (AssetTbl[i].id == "tblAssetHx")
{
RowID =AssetTbl[i].rows[1].cells[0].childNodes[0].data;
if (RowID == ID)

[Code]...