window.addEvent('load', function(){ 
        var slideLeft = new Fx.Tween('leftslide', {property: 'right', duration: 500 }); 
        var state_1 = 960; 
        $('m_toggle').addEvent('click', function(){ 
            state_1 = (state_1 == 750 ? 960 : 750); 
            slideLeft.start(state_1); 
        }); 
       
	/*var slideRight = new Fx.Tween('rightslide', {property: 'right', duration: 500 }); 
        var state_2 = 960; 
        $('m_toggle').addEvent('click', function(){ 
            state_2 = (state_2 == 710 ? 960 : 710); 
            slideRight.start(state_2); 
        }); */
        
    });