function cascadedstyle(el, cssproperty, csspropertyNS){
  if (el.currentStyle)
    return el.currentStyle[cssproperty]
  else if (window.getComputedStyle){
    var elstyle=window.getComputedStyle(el, "")
    return elstyle.getPropertyValue(csspropertyNS)
  }
}

var previoustab=""
var previoustabobj=""

function expandcontent(cid, aobject){
  if (document.getElementById){
    highlighttab(aobject)
    detectSourceindex(aobject)
    if (previoustab!=""){
      document.getElementById(previoustab).style.display="none"
      previoustabobj.style.backgroundImage="url('skins/viptexting/images/btns/loginnfbtn.gif')";
    }
    document.getElementById(cid).style.display="block"
    aobject.style.backgroundImage="url('skins/viptexting/images/btns/loginbtn.gif')";
    previoustab=cid
    previoustabobj=aobject
    if (aobject.blur)
      aobject.blur()
    return false
  }
  else
    return true
}

function highlighttab(aobject){
  if (typeof tabobjlinks=="undefined")
    collecttablinks()
  for (i=0; i<tabobjlinks.length; i++)
    tabobjlinks[i].style.backgroundColor=initTabcolor
  var themecolor=aobject.getAttribute("theme")? aobject.getAttribute("theme") : initTabpostcolor
  aobject.style.backgroundColor=document.getElementById("tabcontentcontainer").style.backgroundColor=themecolor
}

function collecttablinks(){
  var tabobj=document.getElementById("tablist")
  tabobjlinks=tabobj.getElementsByTagName("A")
}

function detectSourceindex(aobject){
  for (i=0; i<tabobjlinks.length; i++){
    if (aobject==tabobjlinks[i]){
      tabsourceindex=i //source index of tab bar relative to other tabs
      break
    }
  }
}

function do_onload(){
  var cookiename=(typeof persisttype!="undefined" && persisttype=="sitewide")? "tabcontent" : window.location.pathname
  var cookiecheck=window.get_cookie && get_cookie(cookiename).indexOf("|")!=-1
  collecttablinks()
  initTabcolor=cascadedstyle(tabobjlinks[1], "backgroundColor", "background-color")
  initTabpostcolor=cascadedstyle(tabobjlinks[0], "backgroundColor", "background-color")
  if (typeof enablepersistence!="undefined" && enablepersistence && cookiecheck){
    var cookieparse=get_cookie(cookiename).split("|")
    var whichtab=cookieparse[0]
    var tabcontentid=cookieparse[1]
    expandcontent(tabcontentid, tabobjlinks[whichtab])
  }
  else
    expandcontent(initialtab[1], tabobjlinks[initialtab[0]-1])
}

if (window.addEventListener)
  window.addEventListener("load", do_onload, false)
else if (window.attachEvent)
  window.attachEvent("onload", do_onload)
else if (document.getElementById)
  window.onload=do_onload

var enablepersistence=true
var persisttype="local"

function get_cookie(Name) {
  var search = Name + "="
  var returnvalue = "";
  if (document.cookie.length > 0) {
    offset = document.cookie.indexOf(search)
    if (offset != -1) {
      offset += search.length
      end = document.cookie.indexOf(";", offset);
      if (end == -1) end = document.cookie.length;
        returnvalue=unescape(document.cookie.substring(offset, end))
    }
  }
  return returnvalue;
}

function savetabstate(){
  var cookiename=(persisttype=="sitewide")? "tabcontent" : window.location.pathname
  var cookievalue=(persisttype=="sitewide")? tabsourceindex+"|"+previoustab+";path=/" : tabsourceindex+"|"+previoustab
  document.cookie=cookiename+"="+cookievalue
}

window.onunload=savetabstate