var gbURL="";
var domainURL=""
var imagePath="";
var gbURLFlag=false;
var winURL=location.href.toString().toLowerCase();

if (winURL.search('www.ugc.edu.hk')==-1 && winURL.search('www0.ugc.edu.hk')==-1){
	gbURL="";
}

domainURL="http"+"://"+getDomain(replaceCharacters(winURL,gbURL,''));

if (winURL.search('/eng/')!=-1){
   imagePath="/eng/images";
} else {
	if (winURL.search('/big5/')!=-1){
		imagePath="/big5/images";
	}
	if (winURL.search('/chs/')!=-1){
		gbURLFlag=true;
//		domainURL="http"+"://"+gbURL+getDomain(replaceCharacters(winURL,gbURL,''));
		imagePath="/chs/images";
	}
}
if (winURL.search('/cgi-bin/ugc/')!=-1){
	imagePath="/eng/images";
}

function getDomain(url) {
 var lead_slashes=url.indexOf("://");
 var domain_start=lead_slashes + 3;
 var without_resource=url.substring(domain_start,url.length);
 var next_slash=without_resource.indexOf("/");
 var domain=without_resource.substring(0, next_slash);
 return domain;
}

function route(from, to){
	var langsBtn = ['eng','big5','gb'];
	var langsPath= ['eng','big5','chs'];
	var fromLangId = 0;
	var toLangId = 0;
	var target = '';
	for(x in langsBtn){
		if(location.href.search('/'+langsPath[x]+'/')!=-1)	fromLangId = x;
		if(to==langsBtn[x])	toLangId = x;
	}
	target = location.href.replace('/'+langsPath[fromLangId]+'/', '/'+langsPath[toLangId]+'/');
	
	var subSite = ['ugc','rgc','qac'];
	var subSiteChs = ['ugc','chs_rgc','qac'];
	var fromSubSite, toSubSite;
	var subSiteId = 0;
	if(fromLangId==2){
		fromSubSite = subSiteChs;
		toSubSite = subSite;
	}else if(toLangId == 2){
		fromSubSite = subSite;
		toSubSite = subSiteChs;
	}else{
		fromSubSite = subSite;
		toSubSite = subSite;
	}
	for(x in fromSubSite){
		if(location.href.search('/'+fromSubSite[x]+'/')!=-1)	subSiteId = x;
	}
	target = target.replace('/'+fromSubSite[subSiteId]+'/', '/'+toSubSite[subSiteId]+'/');
	
	location.href = target;
}

function replaceCharacters(conversionString,inChar,outChar){
  var convertedString = conversionString.split(inChar);
  convertedString = convertedString.join(outChar);
  return convertedString;
}

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_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_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];}
}

function switchToBig5() {
 location.href = replaceCharacters(location.href.toString(),'/eng/','/big5/');
}