function createTable(w,cn)
{
	return document.createElement('table');
}
function addRow(objTb)
{
	nbRows = objTb.rows.length;
	return objTb.insertRow(nbRows);
}
function addCell(objTr,td_id,txt)
{
	nbCells = objTr.cells.length;
	new_cell = objTr.insertCell(nbCells);
	new_cell.id = td_id;
	oSpan = document.createElement('span');
	oSpan.innerHTML = txt;
	oSpan.id = 'sp_'+td_id;
	new_cell.appendChild(oSpan);
	return new_cell;
}
function addCellRow(objTb,td_id,txt)
{
	objTr = addRow(objTb);
	nbCells = objTr.cells.length;
	new_cell = objTr.insertCell(nbCells);
	new_cell.id = td_id;
	oSpan = document.createElement('span');
	oSpan.innerHTML = txt;
	oSpan.id = 'sp_'+td_id;
	new_cell.appendChild(oSpan);
	return new_cell;
}