API SetScreenResolution

Returns the index of the current resolution in effect
 SetScreenResolution([index])
===Arguments===
:;index: - This value specifies the new screen resolution, it must be the index of one of the values yielded by GetScreenResolutions(). Passing nil will default this argument to 1, the lowest resolution available
===Example===
This sets the screen to 1024x768, if available:
 local resolutions = {GetScreenResolutions()}
 for i,entry in resolutions do
 if entry == '1024x768' then
 SetScreenResolution(i)
 break
 end
 end