Vista - How to eliminate vbscrit text on the message box

Hi, I am having a code like this:

<script language="vbscript">

sub window_OnLoad
frmvalidate.Username.focus
end sub

Sub Submit_OnClick


if frmvalidate.Username.value="" then
msgbox("Please enter User name"),vbokonly, "Name of Company"
'frmvalidate.Username.value=""
frmvalidate.Username.focus
exit sub
end if


end sub

so I don't need the vbscrit on the message box; I only need Name of the
company.Thanks

</script>