var indice_visible = -1;

$(document).ready(function(){

	

	$("li.home_next_btn").click( function () {

		var vItems = [];
		vItems = $("div.work_slider ul li");
		if (vItems.length-indice_visible-4 > 0) {			
			indice_visible++;
			if (indice_visible == 0) {
				$("li.home_prev_btn").removeClass('disabled');
			}
			vItems.eq(indice_visible).animate({ 
				opacity: 0,
			}, 'slow');
			vItems.eq(indice_visible+3).animate({ 
				opacity: 1,
			}, 'slow');
	
			vslider = $("div.work_slider ul");
			vslider.animate( {
				marginLeft:(-360*(indice_visible+1)),
			}, 'slow');
			if (vItems.length-indice_visible-4 == 0) {
				$(this).addClass('disabled');
			}
		}
	});

	$("li.home_prev_btn").click( function () {

		if (indice_visible >= 0) {
			var vItems = [];
			vItems = $("div.work_slider ul li");
			vItems.eq(indice_visible).animate({ 
				opacity: 1,
			}, 'slow');
			vItems.eq(indice_visible+3).animate({ 
				opacity: 0,
			}, 'slow');
	
			vslider = $("div.work_slider ul");
			vslider.animate( {
				marginLeft:-360*indice_visible,
			}, 'slow');
	
			indice_visible--;
			if (indice_visible == -1) {		
				$(this).addClass('disabled');
			}
			if (vItems.length-indice_visible-4 > 0) {		
				$("li.home_next_btn").removeClass('disabled');
			}
		}
	});

 });