What the #@$%*! is "blank0"

[wernerh]

When I reload a IFRAME on my Page on th ONGHANGE event of a select box< I use the line:
onchange="frame1.document.location.replace('MyPage.asp?MyVar=' & form1.cboSelect.value)"

All that loads into the IFRAME is the words "blank 0 "

If I take the form1.cboSelect.value away the correct page displays, but I need to pass the value of that cbo??

Frustrated beyond the piont of strangeling th mouse!!!!!