window.addEvent('domready', function(){ 
// Declaring increment vars 
var interval;

var left2 = $('slider-buttons');
var right2 = $('slider-buttons2');
var totIncrement = 0;
var PortfolioItem = 1;
var increment = 150;
var maxRightIncrement = increment*(-4);
// FX var 
if (PortfolioItem == 1) { 
setTimeout(left2.fade.bind(left2, [0]),0);
}

var fx = new Fx.Tween($('slider-list'), {duration: 500, transition: Fx.Transitions.linear});

    $('previous').addEvent('click', function() {
        if(totIncrement < 0) {
			clearInterval(interval);
			
            totIncrement += increment;
            fx.start('margin-left', totIncrement);
		    PortfolioItem = PortfolioItem -1;
			if (PortfolioItem == 1) { 
setTimeout(left2.fade.bind(left2, [0]),0);
}
			if (PortfolioItem != 1) { 
setTimeout(left2.fade.bind(left2, [1]),0);
}
if (PortfolioItem == 4) { 
setTimeout(right2.fade.bind(right2, [0]),0);
}
if (PortfolioItem != 4) { 
setTimeout(right2.fade.bind(right2, [1]),0);
}
		}
		
    });

    $('next').addEvent('click', function() {
        if(totIncrement > maxRightIncrement) {
			clearInterval(interval);
		
            totIncrement -= increment;
            fx.start('margin-left', totIncrement);
			PortfolioItem = PortfolioItem +1;
					if (PortfolioItem == 1) { 
setTimeout(left2.fade.bind(left2, [0]),0);
}
			if (PortfolioItem != 1) { 
setTimeout(left2.fade.bind(left2, [1]),0);
}
if (PortfolioItem == 4) { 
setTimeout(right2.fade.bind(right2, [0]),0);
clearInterval(interval);
}
if (PortfolioItem != 4) { 
setTimeout(right2.fade.bind(right2, [1]),0);
}
        }
    });





function nextone(){

           if(totIncrement > maxRightIncrement) {
            totIncrement -= increment;
            fx.start('margin-left', totIncrement);
			PortfolioItem = PortfolioItem +1;
			
			if (PortfolioItem == 1) { 
setTimeout(left2.fade.bind(left2, [0]),0);
}
			if (PortfolioItem != 1) { 
setTimeout(left2.fade.bind(left2, [1]),0);
}
if (PortfolioItem == 4) { 
setTimeout(right2.fade.bind(right2, [0]),0);
}
if (PortfolioItem != 4) { 
setTimeout(right2.fade.bind(right2, [1]),0);
}
        }
		
}


});