vbscript error on pop-up wondow IE7

Hi,

I have a problem in pop-up window. I used vbscript function to call the
pop-up window and an error on page is displayed "No Such Interface
supported". I always have this error when I use IE 7 but no error occured in
IE6. My alternative solution here is to convert the vbscript function to
javascript error and no error occured in IE7. My questions here is why I got
an error in IE 7 when I used vbscript to call the pop-up window? I only have
an error on "pop-window" only but in other pages where the vbscript function
is also used there is no error occured. Is IE 7 not supporting the vbscript
on pop-windows? Hope you guys could help me. Thanks in advance...
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joven bautista