A B if ( !canvas.A || canvas.B ){ canvas.setAttribute( "a" , this ); canvas.setAttribute( "b" , null ); } else { canvas.setAttribute( "b" , this ); } Toggle if (tlayout.spacing > -la.width ){ tlayout.animate( "spacing" , -la.width , 1000 ); } else { tlayout.animate( "spacing" , -120 , 1000 ); blayout.update(); } A infrontof B canvas.a.sendInFrontOf( canvas.b ); A behind B canvas.a.sendBehind( canvas.b ); A to front canvas.a.bringToFront(); A to back canvas.a.sendToBack();