Corona Hello World 2

local textObject = display.newText( "Hello World!", 50, 50, native.systemFont, 24 )
textObject:setTextColor( 255,255,255 )

local button = display.newImage( "button.png" )
button.x = display.contentWidth / 2
button.y = display.contentHeight - 50

function button:tap( event )
local r = math.random( 0, 255 )
local g = math.random( 0, 255 )
local b = math.random( 0, 255 )

textObject:setTextColor( r, g, b )
end

button:addEventListener( "tap", button )