function update(e, dd)
{
for (j=1; j < dd.length; j++)
{
dd[j][0] = true;
}
for (j=1; j < dd[0].length; j++)
{
for (i=1; i < dd.length; i++)
{
current = dd[i][j].split("|");
value = current[0];
choice = current[0];
if (current.length == 2) choice = current[1];
if (value != document[dd[0][0]][dd[0][j]][document[dd[0][0]][dd[0][j]].selectedIndex].value) dd[i][0] = false;
}
if (e == document[dd[0][0]][dd[0][j]])
{
dropdown(j+1,dd);
for (k=j+2; k < dd[0].length; k++)
{
document[dd[0][0]][dd[0][k]].length = 0;
}
break;
}
}
}

function dropdown(item,dd)
{
var pre1 = "";
var j = 1;
document[dd[0][0]][dd[0][item]].options.length = 0;
document[dd[0][0]][dd[0][item]].options[0] = new Option('- select -', '');
document[dd[0][0]][dd[0][item]].options[0].selected = true;
for (i=1; i < dd.length; i++)
{
if (dd[i][0] || item == 1)
{
current = dd[i][item].split("|");
value = current[0];
choice = current[0];
if (current.length == 2) choice = current[1];
if (value != pre1)
{
var op = new Option(choice, value);
document[dd[0][0]][dd[0][item]].options[j] = op;
j++;
pre1 = value;
}
}
}
}