php - Create a script to download images from Syntax tree generator -

i'm working language school , need download large number of images generated using tool: http://mshang.ca/syntree/ downloaded it, customized tool little can't find way of automatically download images generated. i'm using url create images:

http://mshang.ca/syntree/index.html?i=[བྱ་ཚིག་དང་ཡག [ཕྱེད་བརྗོད་པ [ཅ་ལག་ཉོ་]] [ཡག་ [ཡག་]] [བྱ་ཚིག་ཕལ་པ། [དངུལ་མེད། ]]] 

do have ideas on how should modify source code or how should write script?

thanks

zopa

ps: i'm on linux bash script fine too...