function insertRowNumber() {
	var table = document.getElementById("cadetTable");
	var tableRow = table.getElementsByTagName("tr");
	var output = document.getElementById("output");	

	
	for(var i = 1; i < tableRow.length; i++) {
		var outputCell = table.rows[i].insertCell(0);
		outputCell.innerHTML = i;
	}
	
}