I have worked out how to dynamically create rows and cells of a table
with

myrow = document.all.tablename.insertrow()
 and
mycell = myrow.insertcell()

mycell.innerhtml = "values"

but how do I delete them to re-create it with new data.  Deleterow()
seems a bit crude and as it does not take a number value, probably a
bit slow, if the original table is big.

Also why does document.all.tabname.rows.length = 1 when no rows have
been added to a table nor have any been specified in original HTML

only

<table id="testtab"></table>

Thanks for any help

Tim