#left.scpt
tell application "System Events" to key code 124 using control down
#right.scpt
tell application "System Events" to key code 123 using control down
#up.scpt
tell application "System Events" to key code 126 using control down
#down.scpt
tell application "System Events" to key code 125 using control down
For more event codes: https://apple.stackexchange.com/questions/36943/how-do-i-automate-a-key-press-in-applescript
Select the key which you want to use for performing the gestures.(In my case "Middle Mouse Button")