Lua: Problems with menu -


ok. coding corona program, , in book have followed instructions create menu , create new game scene. problem nothing happens when put code emulator or bluestacks android , press on pictures nothing happens. literally nothing, same button.

what have done wrong? code:

function loadgame(event) if event.target.name == "playbutton"     transition.to(menuscreengroup, {time = 0, alpha=0, oncomplete = addgamescreen})     playbtn:removeeventlistener("tap", loadgame)     end end  function loadhelp(event) if event.target.name == "helpbutton"     transition.to(menuscreengroup, {time = 0, alpha=0, oncomplete = addhelpscreen})     helpbtn:removeeventlistener("tap", loadhelp) end end  function addhelpscreen() helpscreengroup = display.newgroup() helpscreen = display.newimage("helpscreen.png", 0, 0, true) helpscreen.x = _w helpscreen.y = _h  end  function addgamescreen() background = display.newimage("bg.png", 0, 0, true) background.x = _w background.y = _ys  paddle = display.newimage("paddle.png") paddle.x = 160; paddle.y = 460; paddle.name = "paddle"  ball = display.newimage("ball.png") ball.x = 160; ball.y = 460; ball.name = "ball"  scoretext = display.newtext("score:", 5, 2, "arial", 14) scoretext:settextcolor( 255, 255, 255, 255) scorenum = display.newtext("0", 54, 2, "arial", 14) scorenum:settextcolor( 255, 255, 255, 255)  leveltext = display.newtext("level:", 420, 2, "arial", 14) leveltext:settextcolor(255, 255, 255, 255) levelnum = display.newtext("1", 460, 2, "arial", 14) levelnum:settextcolor( 255, 255, 255, 255)  gamelevel1()  currentlevel = 1  bricks:tofront() local numofrows = 4 local numofcolumns = 4 local brickplacement = {x = (_w) - (brickwidth * numofcolumns ) / 2 + 20, y = 50} row = 0, numofrows - 1 local brick = display.newimage("brick.png") brick.name = "brick" brick.x = brickplacement.x + (column * brickwidth) brick.y = brickplacement.y + (row * brickheight) physics.addbody(brick, "static", {density = 1, friction = 0, bounce = 0}) bricks.insert(bricks, brick)  end end  function gamelevel2() currentlevel = 2 bricks:tofront() local numofrows = 5 local numofcolumns = 8 local brickplacement = {x = (_w) - (brickwidth * numofcolumns ) / 2 + 20, y = 50} row = 0, numofrows -  1 column = 0, numofcolumns - 1 -- create brick local brick = display.newimage("brick.png") brick.name = "brick" brick.x = brickplacement.x + (column * brickwidth) brick.y = brickplacement.y + (row * brickheight) physics.addbody(brick, "static", {density = 1, friction = 0, bounce = 0}) bricks.insert(bricks, brick) end end end

check line of code:

background.y = _ys

i think should be:

background.y = _h

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