var refeshPageTimer = null;

function $(id){
        if(typeof(id) == "string") return document.getElementById(id);
        else return id;
}

function RefeshPage(){
    if(typeof(isPost) == 'undefined'){
        window.location.reload();
    }
}

refeshPageTimer = setTimeout("RefeshPage()", 12000000);

function setHomePage2(){
    var isIE= navigator.userAgent.indexOf('MSIE') != -1;

    if(isIE) {
        var url = 'http://hiti.info.vn';

        var homePage = document.body;
        homePage.style.behavior = 'url(#default#homepage)';
        homePage.setHomePage(url);
    } else {
        alert('Nhấn tổ hợp phím [Ctrl+D] để đặt HiTi.Info.vn làm homepage!');
    }
}

function addFavorite2(){
    var url = window.location.href;
    var title = document.title;
    if(document.all) {
        window.external.AddFavorite(url, 'HiTi.Info.vn - ' + title);
    } else if(window.sidebar) {
        window.sidebar.addPanel('HiTi.Info.vn - ' + title, url, '');
    }
}

var itv = 50;
var step = 10;
var start = 0;
var end = 0;
var currentOpac;
function changeOpac(obj, opacity) {
    var object = obj.style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}
function BeginOpacity(obj, s, e){
    start = s;
    end = e;
    currentOpac = s;
    theobject=obj;
    changing=setInterval("opacityit(theobject)",itv);
}

function EndOpacity(obj, end){
    clearInterval(changing);
    changeOpac(obj, end);
}

function opacityit(obj){
    if(start > end) {
        if (currentOpac>end){
            currentOpac = currentOpac - step;
            changeOpac(obj,currentOpac);
        } else if(window.highlighting) clearInterval(highlighting);
    } else if(start < end) {
        if (currentOpac<end){
            currentOpac = currentOpac + step;
            changeOpac(obj,currentOpac);
        } else if (window.changing) clearInterval(changing);
    }
}
function logout(){
    if(confirm('Bạn thật sự muốn đăng xuất khỏi hệ thống !?')) return true;
    else return false;
}

function show_hide(msg_id) {
   $(msg_id).style.display = $(msg_id).style.display == 'none' ? 'block' : 'none';
}

function getStyle(el,style){
        if(typeof el == "string")
                var element = $(el);
        else
                var element = el;
        if (element.currentStyle)
                var value = element.currentStyle[style];
        else if (window.getComputedStyle)
                var value = document.defaultView.getComputedStyle(element,null).getPropertyValue(style);
        return value;
}

function getposOffset(overlay, offsettype){
   var totaloffset=(offsettype=='left')? overlay.offsetLeft : overlay.offsetTop;
   var parentEl=overlay.offsetParent;
   while (parentEl!=null) {
      if(getStyle(parentEl, "position") != "relative"){
             totaloffset=(offsettype=='left')? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
      }
          parentEl=parentEl.offsetParent;
   }
   return totaloffset;
}

function overlay(curobj, subobjstr, opt_position){
   if (document.getElementById){
      var subobj=$(subobjstr)
      subobj.style.display=(subobj.style.display!='block')? 'block' : 'none'
      var xpos=getposOffset(curobj, 'left')+((typeof opt_position!='undefined' && opt_position.indexOf('right')!=-1)? -(subobj.offsetWidth-curobj.offsetWidth) : 0)
      var ypos=getposOffset(curobj, 'top')+((typeof opt_position!='undefined' && opt_position.indexOf('bottom')!=-1)? curobj.offsetHeight : 0)
      subobj.style.left=xpos+'px'
      subobj.style.top=ypos+'px'
      return false
   }
   else return true
}

function overlayclose(subobj){
	$(subobj).style.display='none'
}

NewWindowPopUp = null;
function OpenWindow(src, wdth, hght, wcenter) {
   if (NewWindowPopUp != null) {
        NewWindowPopUp.close();
        NewWindowPopUp = null;
   }
   if (wcenter == false) {
      wtop = 0;
      wleft = 0;
   } else {
        wtop = (screen.availHeight-hght)/2;
        wleft = (screen.availWidth-wdth)/2;
   }
   NewWindowPopUp = window.open(src, "","toolbar=no,menubar=no,location=no,personalbar=no,scrollbars=yes,status=no,directories=no,resizable=yes,height="+hght+",width="+wdth+",top="+wtop+",left="+wleft+"");
   NewWindowPopUp.focus();
}

function showHocphi(value){
    if(value=='Trong khoảng') $('divhocphi').style.display='';
    else $('divhocphi').style.display='none';
}

function changeTab(tabName){
	$('ecomworld').style.display='none';
    $('ecomnews').style.display='none';
    $('ecomworld_div').className = 'tab_gray';
    $('ecomnews_div').className = 'tab_gray';
    $(tabName+'_div').className = 'tab';
    $(tabName).style.display='';
}