The file size limit for a JPG file is 2mb, with a maximum dimension of 1,600 pixels. If you right click on your image and select "Properties" you'll see the numbers for your file. As Craig_R says, you can resize an image in MS Paint.
Bruce Dickson 2013 Thor Challenger 37GT, 5 Star Tune, Safe-T-Plus Steering Control with Air Trim, Roadmaster front and rear Sway Bars, SuperSteer rear Track Bar, Crossfires, 2012 Honda CRV on Blue Ox Aventa LX tow bar. Full timers since Jan 2012.