If your laptop can output DVI (most can't, but some can with a docking station), all you need is a DVI-HDMI cable. You can get a cheap one from monoprice.
Otherwise, what you need is a 'transcoder'. VGA to HDMI(DVI) transcoders are rather expensive. There is VGA to Component transcoder, which is cheaper. Google 'audio authority vga to component transcoder' for one of those.