var menuLeft = document.getElementById( 'cbp-spmenu-s1' ),
				menuRight = document.getElementById( 'cbp-spmenu-s2' ),
				showLeft = document.getElementById( 'showLeft' ),
				hideLeft = document.getElementById( 'hideLeft' ),
				showRight = document.getElementById( 'showRight' ),
				hideRight = document.getElementById( 'hideRight' ),
				body = document.body;

			showLeft.onclick = function() {
				classie.toggle( this, 'active' );
				classie.toggle( menuLeft, 'cbp-spmenu-open' );
				disableOther( 'showLeft' );
			};
			hideLeft.onclick = function() {
				classie.toggle( menuLeft, 'cbp-spmenu-open' );
				disableOther( 'hideLeft' );
			};
			showRight.onclick = function() {
				classie.toggle( this, 'active' );
				classie.toggle( menuRight, 'cbp-spmenu-open' );
				disableOther( 'showRight' );
			};
			hideRight.onclick = function() {
				classie.toggle( this, 'active' );
				classie.toggle( menuRight, 'cbp-spmenu-open' );
				disableOther( 'hideRight' );
			};
			function disableOther( button ) {
				if( button !== 'showLeft' ) {
					classie.toggle( showLeft, 'disabled' );
				}
				if( button !== 'showRight' ) {
					classie.toggle( showRight, 'disabled' );
				}
				
			}