ÿþ// Display image with links to different language versions of the

// current page:





// HanWEB prefix

var hanweb_prefix = "/chs/";



// Image locations

var imgHost   = "images/";

var imgSrc_en = imgHost + "contents-eng.jpg";

var imgSrc_tc = imgHost + "contents-big5.jpg";

var imgSrc_sc = imgHost + "contents-gb.jpg";





function replaceCharacters(conversionString,inChar,outChar){

  var convertedString = conversionString.split(inChar);

  convertedString = convertedString.join(outChar);

  return convertedString;

}



// Object to store links to the 3 versions of the current page

function LangLinks(en, tc, sc)

{

	this.en = en; // English

	this.tc = tc; // Traditional Chinese

	this.sc = sc; // Simplified Chinese

}





// Simple string replacement function

function kh_string_replace(str, start, length, substr)

{

	var tmpstr = str.substr(0, start);

	tmpstr += substr;

	tmpstr += str.substr(start + length);

	return tmpstr;

}





// This function determines the current viewing language

// Return:

//  0 - viewing English

//  1 - viewing Traditional Chinese

//  2 - viewing Simplified Chinese

function kh_get_current_lang()

{

	// Get the URL without protocol and "//"

	var href = self.location.href.substr(self.location.protocol.length +  2);



	if (href.indexOf(hanweb_prefix) > 0)

		return 2;



	if (href.indexOf("/big5/") > 0)

		return 1;



	if (href.indexOf("/eng/") == 0)

		return 0;



	return 0;

}





// Current page is in English; get Traditional and Simplified Chinese links



function kh_get_en_links(langLinks)

{

	// Extract English URL without protocol

	var pro = self.location.protocol;

	var href_en = self.location.href;

	var href_en_no_pro = href_en.substr(pro.length + 2); // skip protocol and "//"

	

	// Construct Traditional Chinese URL without protocol

	var pos = href_en_no_pro.indexOf("/eng/");

	var href_tc_no_pro = replaceCharacters(href_en_no_pro,'/eng/','/big5/');

	var href_sc_no_pro = replaceCharacters(href_en_no_pro,'/eng/','/chs/');

	

	langLinks.en = href_en;

	langLinks.tc = pro + "//" + href_tc_no_pro;

	langLinks.sc = pro + "//" + href_sc_no_pro;

}



// Current page is in Traditional Chinese; get English and Simplified Chinese links

function kh_get_tc_links(langLinks)

{

	// Extract Traditional Chinese URL without protocol

	var pro = self.location.protocol;

	var href_tc = self.location.href;

	var href_tc_no_pro = href_tc.substr(pro.length + 2); // skip protocol and "//"



	// Construct English URL without protocol

	var pos = href_tc_no_pro.indexOf("/big5/");

	var href_en_no_pro = replaceCharacters(href_tc_no_pro,'/big5/','/eng/');

	var href_sc_no_pro = replaceCharacters(href_tc_no_pro,'/big5/','/chs/');



	langLinks.en = pro + "//" + href_en_no_pro;

	langLinks.tc = href_tc;

	langLinks.sc = pro + "//" + href_sc_no_pro;

}





// Current page is in Simplified Chinese; get English and Traditional Chinese links

function kh_get_sc_links(langLinks)

{

	// Extract Traditional Chinese URL without protocol

	var pro = self.location.protocol;

	var href_sc = self.location.href;

	var href_sc_no_pro = href_sc.substr(pro.length + 2); // skip protocol and "//";



	// Skip HanWEB prefix to find Traditional Chinese URL

	// 20090605 var pos = href_sc_no_pro.indexOf(hanweb_prefix) + hanweb_prefix.length;

	// 20090605 var href_tc_no_pro = href_sc_no_pro.substr(pos);



	var pos = href_sc_no_pro.indexOf("/chs/");

	var href_en_no_pro = replaceCharacters(href_sc_no_pro,'/chs/','/eng/');

	var href_tc_no_pro = replaceCharacters(href_sc_no_pro,'/chs/','/big5/');



	// 20090605 pos = href_tc_no_pro.indexOf("/big5/");

	// 20090605 var href_en_no_pro = replaceCharacters(href_tc_no_pro,'/big5/','/eng/');



	langLinks.en = pro + "//" + href_en_no_pro;

	langLinks.tc = pro + "//" +href_tc_no_pro;

	langLinks.sc = href_sc;

}





// This function writes the two language "buttons"

function kh_main()

{

	var alt1  = "";

	var alt2  = "";

	var alt3  = "";

	var src1  = "";

	var src2  = "";

	var src3  = "";

	var href1 = "";

	var href2 = "";

	var href3 = "";



	var langLinks = new LangLinks("", "", ""); // create object to hold links

	var curLang = kh_get_current_lang(); // guess current language



	// Get links, images, and text for language selection

	if (curLang == 1)

	{

		kh_get_tc_links(langLinks);

		href1 = langLinks.en;

		href2 = langLinks.sc;

		alt1 = "ñ‚‡e";

		alt2 = "!|Ôš-N‡e";

		src1 = imgSrc_en;

		src2 = imgSrc_sc;

	}

	else if (curLang == 2)

	{

		kh_get_sc_links(langLinks);

		href1 = langLinks.en;

		href2 = langLinks.tc;

		alt1 = "ñ‚‡e";

		alt2 = "A~SO-N‡e";

		src1 = imgSrc_en;

		src2 = imgSrc_tc;

	}

	else

	{

		kh_get_en_links(langLinks);

		href1 = langLinks.tc;

		href2 = langLinks.sc;

		alt1 = "Traditional Chinese";

		alt2 = "Simplified Chinese";

		src1 = imgSrc_tc;

		src2 = imgSrc_sc;

	}



	str  = '<TABLE cellSpacing=0 cellPadding=0 border=0>';

    str += '<TBODY>';

    str += '	<TR> ';

    str += '		<TD><a href="' + href1 + '"><img src="' + src1 + '" alt="' + alt1 + '" border="0" width="100"></a></TD>';

    str += '	</TR>';

    str += '	<TR> ';

    str += '		<TD height=10></TD>';

    str += '	</TR>';

    str += '	<TR> ';

    str += '		<TD><a href="' + href2 + '"><img src="' + src2 + '" alt="' + alt2 + '" border="0" width="100"></a></TD>';

    str += '	</TR>';

    str += '</TBODY>';

    str += '</TABLE>';



	document.writeln(str);

}



kh_main();



// End of file