Welcome to HWC.
Well, laptop displays these days generally use a signalling protocol called LVDS (low voltage differential signalling - related to the TMDS used in DVI output). Older displays use a variety of different standards.
So assume it is LVDS, then you need a DVI to LVDS converter (essentially TMDS to LVDS). The only devicess I've seen that do such a thing are extremely expensive multipurpose units such as SGI's Multilink boxes - they are about $600! I haven't come a cross a standalone device designed for this purpose but imagine they would be extremely expensive also. Could be wrong - transforming one digital signal into another should just require a DSP of some sort.
Opteron firstname.lastname@example.orgGHz (stock HS/fan), Asus A8N-SLI SE (passive NB), 1.5GB RAM (2:3:2:5, 2T), WD Raptor 740GD 74GB, Maxtor DM10 300GB, Asus EN7600GT SILENT@???, M-Audio Revo 7.1, Nebula DigiTV, Dell 2005FPW, Enermax 431W Active.