codice:
<script>
function riporta(f) {
  c = nomeIframeColori.document.nomeFormColori;
  for (var i=1;i<11;i++) {
    f.elements["color_"+i].value = c.elements["color_"+i].value;
  }
}
</script>
...
<form method="post" action="insert.asp" onsubmit="riporta(this);">
<input type=hidden name="color_1">
<input type=hidden name="color_2">
...
<input type=hidden name="color_10">
<table>
...
ciao