$(function(){

        var sAcrive = $("#portfolio-navigation a.active");
        var serv_next = $("#portfolio-navigation a.active").parent().next().find("a");
        var serv_prev = $("#portfolio-navigation a.active").parent().prev().find("a");

        /* Next */
        if(serv_next.html()!=null){
            var nextHref = serv_next.attr("href");
            var nextHtml = serv_next.html();
            $("#portfolio-next").attr("href", nextHref);
            $("#portfolio-next small").html(nextHtml);
        }
        else{
            var master = $("#portfolio-navigation a.active").parents(".parentN");
            if(master.next(".parentN").html()!=null){
                var first_link_href = master.next(".parentN").find("ul a:first").attr("href");
                var fhtml = master.next(".parentN").find("ul a:first").html();
                $("#portfolio-next").attr("href", first_link_href);
                $("#portfolio-next small").html(fhtml);
            }
            else{$("#portfolio-next").hide()}
        }
         /* Previous */
        if(serv_prev.html()!=null){
            var nextHref = serv_prev.attr("href");
            var nextHtml = serv_prev.html();
            $("#portfolio-previous").attr("href", nextHref)
            $("#portfolio-previous small").html(nextHtml)
        }
        else{
           var master = $("#portfolio-navigation a.active").parents(".parentN");
           if(master.prev(".parentN").html()!=null){
                var last_link_href = master.prev(".parentN").find("ul a:last").attr("href");
                var last_link_html = master.prev(".parentN").find("ul a:last").html();
                $("#portfolio-previous").attr("href", last_link_href)
                $("#portfolio-previous small").html(last_link_html)
            }
            else{
                $("#portfolio-previous").hide()
            }
        }



        /* Click */
        var Aprev = document.getElementById('portfolio-previous');
        var Anext = document.getElementById('portfolio-next');
        Aprev.onclick = function(){
             $("#serviceSlideSpan").animate({"left":'100px'}, function(){
                var newUrl = Aprev.href;
                window.location.href = newUrl;
             });
             return false;
        }

        Anext.onclick = function(){
             $("#serviceSlideSpan").animate({"left":'560px'}, function(){
                var newUrl = Anext.href;
                window.location.href = newUrl;
             });
             return false;
        }

    });


function Browser() {
 //Xmin = 100;
 Xmin = 170;
 //Xmax = 560;
 Xmax = 470;
  var ua, s, i;

  this.isIE    = false;
  this.isNS    = false;
  this.version = null;

  ua = navigator.userAgent;

  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }


  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = 6.1;
    return;
  }
}

var browser = new Browser();

// Global object to hold drag information.

var dragObj = new Object();
dragObj.zIndex = 0;

function dragStart(event, id) {

  var el;
  var x, y;

  // If an element id was given, find it. Otherwise use the element being
  // clicked on.

  if (id)
    dragObj.elNode = document.getElementById(id);
  else {
    if (browser.isIE)
      dragObj.elNode = window.event.srcElement;
    if (browser.isNS)
      dragObj.elNode = event.target;

    // If this is a text node, use its parent element.

    if (dragObj.elNode.nodeType == 3)
      dragObj.elNode = dragObj.elNode.parentNode;
  }

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
  }

  // Save starting positions of cursor and element.

  dragObj.cursorStartX = x;
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);

  if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
  // Update element's z-index.

  dragObj.elNode.style.zIndex = ++dragObj.zIndex;

  // Capture mousemove and mouseup events on the page.

  if (browser.isIE) {
    document.attachEvent("onmousemove", dragGo);
    document.attachEvent("onmouseup",   dragStop);
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS) {
    document.addEventListener("mousemove", dragGo,   true);
    document.addEventListener("mouseup",   dragStop, true);
    event.preventDefault();
  }
}

function dragGo(event) {

  var x, y;
  var xcurr = parseFloat($("#serviceSlideSpan").css("left"));
  if((xcurr < Xmax ) && (xcurr > Xmin)){



  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
  }

  // Move drag element by the same amount the cursor has moved.

  dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";

  if (browser.isIE) {
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS)
    event.preventDefault();

   }

   if(xcurr>=Xmax){
    $("#portfolio-next").click()
   }
   if(xcurr<=Xmin){
    $("#portfolio-previous").click()
   }

}

function dragStop(event) {

  // Stop capturing mousemove and mouseup events.

  if (browser.isIE) {
    document.detachEvent("onmousemove", dragGo);
    document.detachEvent("onmouseup",   dragStop);
  }
  if (browser.isNS) {
    document.removeEventListener("mousemove", dragGo,   true);
    document.removeEventListener("mouseup",   dragStop, true);
  }
}