Connecting 2 external VGA monitors to an E535

I already have one external VGA monitor connected to my Thinkpad E535 via the VGA port.
What is the best way to connect a second VGA external monitor?
Should I use a VGA-USB or VGA-HDMI converter?
Do the converters need to have their own graphics card or can the E535 built in graphics card deal with 3 (laptop + 2 external) monitors running simultaneously?
Thanks for any help! R

Hi,
To get a third independant Display you need something like this...
http://eshop.macsales.com/item/NewerTech/VIDU2DVIA/

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