//*****************************************************************************
// Menu object
//*****************************************************************************
var TOP_OFFSET_DEFAULT   = 75;
var TOP_MENU_OFFSET      = 15;
var LEFT_OFFSET_DEFAULT  = -10;
var RIGHT_OFFSET_DEFAULT = 20;
var MAX_WIDTH            = 920;
var CURR_MENU            = -1;
var menuItems;

function menuItem( text, width, height, left, top, searchIdx, data )
{
   this.recalc    = true;
   this.text      = text;
   this.width     = width;
   this.height    = height;
   this.left      = left;
   this.top       = top;
   this.searchIdx = searchIdx;
   this.data      = data;
}

function showMenuItem()
{
   // position the div and display the nav
   if (this.data != '')
   {
      var shim     = document.getElementById("shim");
      var menu_div = document.getElementById("top_nav");

      menu_div.style.width   = this.width+"px";
      menu_div.style.left    = this.left+"px";
      menu_div.style.top     = this.top+"px";
      menu_div.style.display = 'block';
      menu_div.innerHTML     =  this.data;

      shim.style.width   = this.width+"px";
      shim.style.height  = menu_div.offsetHeight +"px";
      shim.style.left    = this.left+"px";
      shim.style.top     = this.top+"px";
      shim.style.display = 'block';

   }
}

function hideMenuItem()
{
   var navItem = document.getElementById ("tnav" + CURR_MENU);
   if( navItem )
      navItem.className = "white_n";

   CURR_MENU = -1;

   var menu_div = document.getElementById("top_nav");
   menu_div.style.display = 'none';

   var shim = document.getElementById("shim");
   shim.style.display = 'none';

   return true;
}

function recomputeLayout(elem)
{
   if( this.recalc )
   {
      var width = window.document.body.clientWidth;
      if( width > MAX_WIDTH )
         width = MAX_WIDTH;

      if( width > (this.width + this.left) )
         this.left = elem.offsetLeft + LEFT_OFFSET_DEFAULT;
      else
         this.left = width - (this.width + RIGHT_OFFSET_DEFAULT);

      this.top  = elem.offsetTop + TOP_MENU_OFFSET;

      p = elem.offsetParent;
      while(p)
      {
         if( width > (this.width + this.left) )
            this.left += p.offsetLeft;
         else
            this.left = width - (this.width + RIGHT_OFFSET_DEFAULT);

         this.top  += p.offsetTop;

         p = p.offsetParent;
      }

      this.recalc = false;
   }
};

menuItem.prototype.show   = showMenuItem;
menuItem.prototype.hide   = hideMenuItem;
menuItem.prototype.layout = recomputeLayout;

//*****************************************************************************
// Menu functions
//*****************************************************************************
function displayitems(elem)
{
   var idx = elem.id.replace( /tnav/, "" );

   var anItem = menuItems[idx];

   anItem.layout(elem);

   //identify clicked link so it can be highlighted
   if (CURR_MENU != idx)
   {
      // hide the old item
      if(CURR_MENU != -1)
      {
         var oldItem = menuItems[CURR_MENU];
         if(oldItem)
            oldItem.hide();

         var oldElem = document.getElementById ("tnav" + CURR_MENU);
         if( oldElem )
            oldElem.className = "white_n";
      }

      // load the html
      if (anItem.data == '')
      {
         var menu_div = document.getElementById("top_nav");

         menu_div.style.display = 'block';
         menu_div.style.width   = anItem.width+"px";
         menu_div.style.left    = anItem.left+"px";
         menu_div.style.top     = anItem.top+"px";
         menu_div.innerHTML     = "Loading...";

         var ajaxData = new Ajax;

         ajaxData.getXml("/include/top_nav_items.asp", "top_nav_id=" + anItem.searchIdx, anItem, loadMenuHtml)
      }
      else
      {
         anItem.show();
      }

      elem.className = 'yellow';

      CURR_MENU = idx;
   }
   else
   {
      anItem.hide();
   }
   return false;
}

function loadMenuHtml(anItem, html)
{
   html_response = html.responseText;
   if (html_response != "")
   {
      anItem.data = html_response;
      anItem.show();
   }
}

function hidemenuitem()
{
   if( CURR_MENU != -1 )
      menuItems[CURR_MENU].hide();
}

var oldResizeFunction    = window.onresize;

function handleResize()
{
   if( menuItems )
   {
      for (i = 0; i < menuItems.length; i++)
      {
         menuItems[i].recalc = true;
      }

      if( CURR_MENU != -1 )
      {
         menuItems[CURR_MENU].hide();
      }
   }

   if(oldResizeFunction)
      oldResizeFunction();
}

window.onresize = handleResize;

//*****************************************************************************
// Search functions
//*****************************************************************************
function ConstructURL(u,remove,add)
{
   var p = BuildURLArray(u);
   var n = "";
   for (var i=0; i<p.length; i++)
   {
      val = CheckArray(remove,p[i][0]);
      if (val == -1)
         n = n + "&" + p[i][0] + "=" + p[i][1];
   }
   for (var i=0; i<add.length; i++)
   {
      n = n + "&" + add[i];
   }
   if (n.length > 0)
   {
      n = n.substr(1);
      n = "?"+n;
   }
   else
   {
      n = "?N="+eneroot;
   }
   return n;
}

function BuildURLArray(u)
{
   var a = new Array();
   var n;
   if (u == "CURRENTURL")
      n = location.search;
   else if (u == "BLANKURL")
   {
   }
   else
   {
      var t = u.split("?");
      n = "?"+t[1];
   }
   if (n)
   {
      n = n.substr(1);
      var s = n.split("&");
      for(var i=0; i<s.length; i++)
      {
         var p = s[i].split("=");
         a[i] = p;
      }
   }
   return a;
}

function CheckArray(remove,check)
{
   for (var i=0; i<remove.length; i++) {
      if (remove[i] == check)
         return 1;
   }
   return -1;
}

function GetValue(u, t)
{
   var p = BuildURLArray(u);
   for (var i=0; i<p.length; i++)
   {
      if (p[i][0] == t)
      {
         return p[i][1];
      }
   }
   return -1;
}

var defaultTerm = "Enter%20Your%20Search%20Term";

function Search()
{
   // Get search property and term values from form elements
   var frm    = window.document.search_terms_form;
   var t      = escape(frm.searchterms.value);
   var within = false;
   if(document.getElementsByName('within').length > 0)
   {
      within = frm.within.checked;
   }

   if(t == defaultTerm || t == '')
   {
      alert ("Oops! You forgot to enter a keyword or product number before hitting \"GO\".  \n\t\tPlease try again.");
   }
   else
   {
      // Create new url with property search and dimension search
      if (within == false)
      {
         var dept = "";
         add      = ["N=" + ((dept == "") ? "0" : dept), "Ntt="+t, "Ntk=All", "Nty=1", "D="+t, "Dx=mode matchall"];
         remove   = ["N", "CusaNe", "Ntt", "Ntk", "Nty", "D", "No", "Dx", "autoredir", "search", "search_redir", "Swl", "product_code", "cm_ven", "cm_cat", "cm_pla", "cm_ite", "engine", "amount", "pfp", "prod_group_category_id", "mfg_id", "mfg_name", "Cn"];
      }
      else
      {
         var oldterms = escape(frm.oldterms.value);
         var olddept  = escape(frm.olddept.value);

         add    = ["N=" + ((olddept == "") ? "0" : olddept), "Ntt="+t + ' ' + oldterms, "Ntk=All", "Nty=1", "D="+t + ' ' + oldterms, "Dx=mode matchall"];
         remove = ["N", "Ntt", "Ntk", "Nty", "D", "No", "Dx", "autoredir", "search", "search_redir", "Swl", "product_code", "cm_ven", "cm_cat", "cm_pla", "cm_ite", "engine", "amount", "pfp", "Cn"];
      }

      var u = ConstructURL("CURRENTURL", remove, add);
      location.href = "/products/products.asp" + u;
   }
}

function clearSearchBox(c)
{
   if(escape(c.value) == defaultTerm)
   {
      c.value = "";
   }
}