Is there a cable to connect a laptop's VGA monitor OUT, to a HDTV HDMI IN?

Question

I want to display computer images/videos on a HDTV screen.

Answer 1

NO
VGA is analog, HDMI is digital.
Buy a TV with VGA input or buy a graphics card for your PC with DVI or HDMI output.

Answer 2

Odds are you can get this done via a different input on your tv. Worst case scenario, get any cheap graphics card that has DVI output, then get a DVI to HDMI cable.
Otherwise, try and see if you have S-video or plain yellow video out.
I would like to know which model tv you have.
If you MUSt use HDMI, get a HDMI scale/switcher/etc, GEFEN makes cool ones; I thik they have VGA inputs too.