var imgPath = "http://v2.nexsens.com/images/";
function searchbarToggle() {
    var box = document.getElementById("searchbox");
    if(box.value == "search")
        box.value = ""
    else if (box.value == "")
        box.value = "search";
}
// swaps the image for left endpiece of the upper navigation menu
function leftMenuBar() {
    var pos = document.getElementById("navbarLeft").style.backgroundPosition;
    if (pos == '' || pos == '0px 0px')
        document.getElementById("navbarLeft").style.backgroundPosition = '0px -29px';
    else
        document.getElementById("navbarLeft").style.backgroundPosition = '0px 0px';
}
var DDSPEED = 5;
var DDTIMER = 20;
// main function to handle the mouse events //
function ddMenu(id,d){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
    if(c.maxh && c.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.display = 'block';
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
    }
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
}

// collapse the menu //
function ddCollapse(c){
    c.timer = setInterval(function() { ddSlide(c, -1) }, DDTIMER);
    //alert("menu is going up!");
}

// cancel the collapse if a user rolls over the dropdown //
function cancelHide(id){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
  }else{
    dist = (Math.round(currh / DDSPEED));
  }
  if(dist <= 1 && d == 1){
      dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = currh / c.maxh;
  c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
      clearInterval(c.timer);
      //alert("menu is all the way down!");
  }
}