(function(){
	//Scroll para determinado element
	//paddingTop : quantos px acima (Positivo) ou abaixo (valor negativo) da pergunta
	$.fn.scrollTo = function (options) {
	    var defaults = 
	    {
			speed 		  : 1000,
			paddingTop 	  : 0
	    };
		
	    var settings = $.extend(defaults, options );
	    var larguraAreaMensagens = $('#area-mensagens') != null ?  $('#area-mensagens').height() : 0;
	    var offSet = $(this) != null ? parseInt($(this).offset().top) : 0;
	    
	    $('html, body').animate({
	        scrollTop: offSet - (larguraAreaMensagens + settings.paddingTop)
	    }, settings.speed);
	};
	
	//Scroll buttons nav
	$.fn.scrollButtons = function() {
		$(this).append("<div style='display:none;' class='nav_up no-print' id='nav_up'></div>");
		$(this).append("<div style='display:none;' class='nav_down no-print' id='nav_down'></div>");
		
		var $elem = this;
		
		$('#nav_up').fadeIn('slow');
		$('#nav_down').fadeIn('slow');  
		
		$(window).bind('scrollstart', function(){
			$('#nav_up,#nav_down').stop().animate({'opacity':'0.2'});
		});
		$(window).bind('scrollstop', function(){
			$('#nav_up,#nav_down').stop().animate({'opacity':'1'});
		});
		
		$('#nav_down').click(
			function (e) {
				$('html, body').animate({scrollTop: $elem.height()}, 800);
			}
		);
		$('#nav_up').click(
			function (e) {
				$('html, body').animate({scrollTop: '0px'}, 800);
			}
		);
		
	};
	
    var special = jQuery.event.special,
        uid1 = 'D' + (+new Date()),
        uid2 = 'D' + (+new Date() + 1);
        
    special.scrollstart = {
        setup: function() {
            
            var timer,
                handler =  function(evt) {
                    
                    var _self = this,
                        _args = arguments;
                    
                    if (timer) {
                        clearTimeout(timer);
                    } else {
                        evt.type = 'scrollstart';
                        jQuery.event.handle.apply(_self, _args);
                    }
                    
                    timer = setTimeout( function(){
                        timer = null;
                    }, special.scrollstop.latency);
                    
                };
            
            jQuery(this).bind('scroll', handler).data(uid1, handler);
            
        },
        teardown: function(){
            jQuery(this).unbind( 'scroll', jQuery(this).data(uid1) );
        }
    };
    
    special.scrollstop = {
        latency: 300,
        setup: function() {
            
            var timer,
                    handler = function(evt) {
                    
                    var _self = this,
                        _args = arguments;
                    
                    if (timer) {
                        clearTimeout(timer);
                    }
                    
                    timer = setTimeout( function(){
                        
                        timer = null;
                        evt.type = 'scrollstop';
                        jQuery.event.handle.apply(_self, _args);
                        
                    }, special.scrollstop.latency);
                    
                };
            
            jQuery(this).bind('scroll', handler).data(uid2, handler);
            
        },
        teardown: function() {
            jQuery(this).unbind( 'scroll', jQuery(this).data(uid2) );
        }
    };
    
})();