Delete rows from an expanding table

Hello,

I have an expanding table that allows users to click a "+" button in the row to add more rows.  The table contains required fields.  There is a radio button in another part of the form that if set to "No", the whole section containing the table is hidden.  I need to delete any extra rows the user may have added to the table before selecting that "No" answer, leaving only the first three rows (2 title rows and the first data row).  So if the table had six names entered (total of 8 rows) I want it to delete 7 rows; I remove the value from the first row separately.  I tried something like this, but I couldn't make it work; I'm not a very experienced scripter.  Thanks.

for (var oLen = Table1.nodes.length; oLen>3; t++) {

Table1.parent.parent.instanceManager.removeInstance(oLen);

}