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If you're essentially asking whether you can get some kind of Y-adapter for the 15-pin VGA port on the back of your laptop, the answer is a resounding "no".
If that's not what you're asking, then read on...
It all depends on the graphics chipset in your laptop. If your graphics adapter has multiple DACs (digital-to-analog converters), it can drive multiple monitors. Most "value" laptops will have corresponding "value" video cards, and most likely will have only one DAC. Thus you might have several options for output (i.e. output to the LCD, the external VGA port, or the S-video port, but not any combination). However, higher-end laptops will have multiple DACs, like Wingless's. Having multiple DACs allows his laptop to drive multiple monitors at the same time.
So much for the technical lesson. Try going to your display properties in Windows on the laptop. If your video card drivers are installed properly and the card supports multiple displays, you should have all the appropriate dual-monitor configuration options (I presume you've done this before since you've got dual monitors on your desktop rig). If the driver configuration stuff only shows a single display, then you've probably only got one DAC and are SOL.
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