//** Tab Content script v2.0- © Dynamic Drive DHTML code library (http://www.dynamicdrive.com)
//** Updated Oct 7th, 07 to version 2.0. Contains numerous improvements:
//   -Added Auto Mode: Script auto rotates the tabs based on an interval, until a tab is explicitly selected
//   -Ability to expand/contract arbitrary DIVs on the page as the tabbed content is expanded/ contracted
//   -Ability to dynamically select a tab either based on its position within its peers, or its ID attribute (give the target tab one 1st)
//   -Ability to set where the CSS classname "selected" get assigned- either to the target tab's link ("A"), or its parent container
//** Updated Feb 18th, 08 to version 2.1: Adds a "tabinstance.cycleit(dir)" method to cycle forward or backward between tabs dynamically
//** Updated April 8th, 08 to version 2.2: Adds support for expanding a tab using a URL parameter (ie: http://mysite.com/tabcontent.htm?tabinterfaceid=0) 
////NO NEED TO EDIT BELOW////////////////////////
function ddtabcontent(tabinterfaceid)
   {this.tabinterfaceid = tabinterfaceid;//ID of Tab Menu main container
    this.tabs = document.getElementById(tabinterfaceid).getElementsByTagName("a");//Get all tab links within container
    this.enabletabpersistence = true;
    this.hottabspositions =[];//Array to store position of tabs that have a "rel" attr defined, relative to all tab links, within container
    this.currentTabIndex = 0;//Index of currently selected hot tab (tab with sub content) within hottabspositions[] array
    this.subcontentids =[];//Array to store ids of the sub contents ("rel" attr values)
    this.revcontentids =[];//Array to store ids of arbitrary contents to expand/contact as well ("rev" attr values)
    this.selectedClassTarget = "link";//keyword to indicate which target element to assign "selected" CSS class ("linkparent" or "link")
   }

ddtabcontent.getCookie = function(Name)
   {var re = new RegExp(Name + "=[^;]+", "i"); //construct RE to search for target name/value pair
    if (document.cookie.match(re)) //if cookie found
   return document.cookie.match(re)[0].split( "=")[1];//return its value
    return "";
   };

ddtabcontent.setCookie = function(name, value)
   {document.cookie = name + "=" + value +";path=/";//cookie value is domain wide (path=/)
   };
ddtabcontent.prototype = 
{expandit: function(tabid_or_position)
   { //PUBLIC function to select a tab either by its ID or position(int) within its peers
   this.cancelautorun();//stop auto cycling of tabs (if running)
    var tabref = "";
    try 
       {if (typeof tabid_or_position == "string" && document.getElementById(tabid_or_position).getAttribute("rel")) //if specified tab contains "rel" attr
       tabref = document.getElementById(tabid_or_position);
        else if (parseInt(tabid_or_position) != NaN && this.tabs[tabid_or_position].getAttribute("rel")) //if specified tab contains "rel" attr
       tabref = this.tabs[tabid_or_position];
       }
   catch (err)
       {alert("Invalid Tab ID or position entered!");
       }
    if (tabref != "") //if a valid tab is found based on function parameter
   
   this.expandtab(tabref);//expand this tab
   }
, cycleit: function(dir, autorun)
   { //PUBLIC function to move foward or backwards through each hot tab (tabinstance.cycleit('foward/back') )
   if (dir == "next")
       {var currentTabIndex = (this.currentTabIndex < this.hottabspositions.length - 1) ? this.currentTabIndex + 1: 0;
       }
    else if (dir == "prev")
       {var currentTabIndex = (this.currentTabIndex > 0) ? this.currentTabIndex - 1: this.hottabspositions.length - 1;
       }
    if (typeof autorun == "undefined") //if cycleit() is being called by user, versus autorun() function
   this.cancelautorun();//stop auto cycling of tabs (if running)
   
    this.expandtab(this.tabs[this.hottabspositions[currentTabIndex]]);
   }
, setpersist: function(bool)
   { //PUBLIC function to toggle persistence feature
   
   this.enabletabpersistence = bool;
   }
, setselectedClassTarget: function(objstr)
   { //PUBLIC function to set which target element to assign "selected" CSS class ("linkparent" or "link")
   
   this.selectedClassTarget = objstr || "link";
   }
, getselectedClassTarget: function(tabref)
   { //Returns target element to assign "selected" CSS class to
   
   return (this.selectedClassTarget == ("linkparent".toLowerCase())) ? tabref.parentNode: tabref;
   }
, urlparamselect: function(tabinterfaceid)
   {var result = window.location.search.match(new RegExp(tabinterfaceid + "=(\\d+)", "i"));//check for "?tabinterfaceid=2" in URL
   
    return (result == null) ? null: parseInt(RegExp.$1);//returns null or index, where index (int) is the selected tab's index
   }
, expandtab: function(tabref)
   {var subcontentid = tabref.getAttribute("rel");//Get id of subcontent to expand
      //Get "rev" attr as a string of IDs in the format ",john,george,trey,etc," to easily search through
    var associatedrevids = (tabref.getAttribute("rev")) ?"," + tabref.getAttribute("rev").replace(/\s+/, "") +",": "";
    this.expandsubcontent(subcontentid);
    this.expandrevcontent(associatedrevids);
    for (var i = 0;i < this.tabs.length;i++)
       { //Loop through all tabs, and assign only the selected tab the CSS class "selected"
       this.getselectedClassTarget(this.tabs[i]).className = (this.tabs[i].getAttribute("rel") == subcontentid) ? "selected": "";
       }
    if (this.enabletabpersistence) //if persistence enabled, save selected tab position(int) relative to its peers
   ddtabcontent.setCookie(this.tabinterfaceid, tabref.tabposition);
   
    this.setcurrenttabindex(tabref.tabposition);//remember position of selected tab within hottabspositions[] array
   }
, expandsubcontent: function(subcontentid)
   {for (var i = 0;i < this.subcontentids.length;i++)
       {var subcontent = document.getElementById(this.subcontentids[i]);//cache current subcontent obj (in for loop)
       
        subcontent.style.display = (subcontent.id == subcontentid) ? "block": "none";//"show" or hide sub content based on matching id attr value
       }
   }
, expandrevcontent: function(associatedrevids)
   {var allrevids = this.revcontentids;
    for (var i = 0;i < allrevids.length;i++)
       { //Loop through rev attributes for all tabs in this tab interface
          //if any values stored within associatedrevids matches one within allrevids, expand that DIV, otherwise, contract it
       
       document.getElementById(allrevids[i]).style.display = (associatedrevids.indexOf("," + allrevids[i] +",") != - 1) ? "block": "none";
       }
   }
, setcurrenttabindex: function(tabposition)
   { //store current position of tab (within hottabspositions[] array)
   for (var i = 0;i < this.hottabspositions.length;i++)
       {if (tabposition == this.hottabspositions[i])
           {this.currentTabIndex = i;
           
            break;
           }
       }
   }
, autorun: function()
   { //function to auto cycle through and select tabs based on a set interval
   
   this.cycleit('next', true);
   }
, cancelautorun: function()
   {if (typeof this.autoruntimer != "undefined")
   clearInterval(this.autoruntimer);
   }
, init: function(automodeperiod)
   {var persistedtab = ddtabcontent.getCookie(this.tabinterfaceid);//get position of persisted tab (applicable if persistence is enabled)
    var selectedtab = - 1;//Currently selected tab index (-1 meaning none)
    var selectedtabfromurl = this.urlparamselect(this.tabinterfaceid);//returns null or index from: tabcontent.htm?tabinterfaceid=index
    this.automodeperiod = automodeperiod || 0;
    for (var i = 0;i < this.tabs.length;i++)
       {this.tabs[i].tabposition = i;//remember position of tab relative to its peers
        if (this.tabs[i].getAttribute("rel"))
           {var tabinstance = this;
            this.hottabspositions[this.hottabspositions.length] = i;//store position of "hot" tab ("rel" attr defined) relative to its peers
            this.subcontentids[this.subcontentids.length] = this.tabs[i].getAttribute("rel");//store id of sub content ("rel" attr value)
           
            this.tabs[i].onclick = function()
               {tabinstance.expandtab(this);
                tabinstance.cancelautorun();//stop auto cycling of tabs (if running)
                return false;
               };
            if (this.tabs[i].getAttribute("rev"))
               { //if "rev" attr defined, store each value within "rev" as an array element
               this.revcontentids = this.revcontentids.concat(this.tabs[i].getAttribute("rev").split(/\s*,\s*/));
               }
            if (selectedtabfromurl == i || this.enabletabpersistence && selectedtab == - 1 && parseInt(persistedtab) == i || ! this.enabletabpersistence && selectedtab == - 1 && this.getselectedClassTarget(this.tabs[i]).className == "selected")
               {selectedtab = i;//Selected tab index, if found
               }
           }
       }//END for loop
    if (selectedtab != - 1) //if a valid default selected tab index is found
   this.expandtab(this.tabs[selectedtab]);//expand selected tab (either from URL parameter, persistent feature, or class="selected" class)
    else //if no valid default selected index found
   this.expandtab(this.tabs[this.hottabspositions[0]]);//Just select first tab that contains a "rel" attr
    if (parseInt(this.automodeperiod) > 500 && this.hottabspositions.length > 1)
       {this.autoruntimer = setInterval(function()
           {tabinstance.autorun();
           }, this.automodeperiod);
       }
   }//END int() function
  };//END Prototype assignment