// Change Tab style
function clear_style(target){
	var ullist = target.parentNode.parentNode.getElementsByTagName("li");
	for (var i = 0; i<ullist.length; i++) {
		ullist[i].className = "";
	}
	return true;
}

function change_css(){
	
	var menu = document.getElementById("menu");
	var tabs = menu.getElementsByTagName("li");

	if(tabs.length > 0){
		//alert("tabs = " + tabs.length);
		for(i=0; i<tabs.length; i++){
			var ulink = tabs[i].getElementsByTagName("a")[0];

			ulink.onclick=function(){
				//alert(this.parentNode.innerHTML);
				if(clear_style(this)){
					this.parentNode.className = "selected";
				}
			}

		}
	}
	
}

// Change Tab logic
var loadstatustext="<center><img src='images_video/loading.gif' align=absmiddle><font size=2 color='#333333'> 正在載入資料...&nbsp;&nbsp;&nbsp;</font></center>"
var bustcachevar=1; //Clear caching of external pages after initial request. (1=yes, 0=no)
var bustcacheparameter="";
var loadedobjects = "";
var rootdomain = "http://"+window.location.hostname;
var defaultcontent = new Object();		// Save default content.

function changeTab(url, containerid, classid) {
	var page_request = false;
	if (window.XMLHttpRequest) {
		// if Mozilla, Safari etc
		page_request = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		// if IE
		try {
			page_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				page_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
			}
		}
	} else {
		return false;
	}

	document.getElementById("info").className = classid;	// Change style for different tag
	
	if (url == "#default") {
		//if simply show default content within container (verus fetch it via ajax)
		//alert("default!");
		document.getElementById(containerid).innerHTML = defaultcontent["default"];
		return;
	}
	
	document.getElementById(containerid).innerHTML=loadstatustext
	page_request.onreadystatechange = function() {
		loadpage(page_request, containerid);
	};
	
	if (bustcachevar) {
		//if clear caching of external page
		bustcacheparameter = (url.indexOf("?") != -1) ? "&"+new Date().getTime() : "?"+new Date().getTime();
	}
//	page_request.open('GET', url+bustcacheparameter, true);
	page_request.open('GET', url, true);
	page_request.send(null);
}

function loadpage(page_request, containerid) {
	if (page_request.readyState == 4 && (page_request.status == 200 || window.location.href.indexOf("http") == -1)) {
		document.getElementById(containerid).innerHTML = page_request.responseText;
	}
}

function savedefaultcontent(){// save default ajax tab content

	var contentid = document.getElementById("info");
	if (typeof defaultcontent["default"]=="undefined") //if default content hasn't already been saved
		defaultcontent["default"] = contentid.innerHTML;
		//alert(defaultcontent["default"]);
}

// Common functions
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
window.open(theURL,winName,features);
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}