I am using this code in main page $w.onReady(function () { //TODO: write your page related code here... $w("#button2").show(); $w("#horizontalMenu1").show(); $w("#button3").hide(); }); and on another page $w.onReady(function () { //TODO: write your page related code here... $w("#horizontalMenu1").hide(); $w("#button2").hide(); $w("#button3").show(); }); to show and hide some elements based on the current context. This works fine on desktop version but for the mobile version I am getting "#horizontalMenu1" is not a valid selector - error. I'm guessing the mobile version is using "mobileMenu1" #instead of "#horizontalMenu1". So how get rid of this error? Can anyone please help me out with this?