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

// current page:





// HanWEB prefix

var hanweb_prefix = "sc.info.gov.hk/gb/";



// Image locations

var imgHost   = "http:" + "//" + "www.ugc.edu.hk/eng/ugc/publication/report/figure2005/images/";

var imgSrc_en = "english.jpg";

var imgSrc_tc = "trad.jpg";

var imgSrc_sc = "simp.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_links2(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 = kh_string_replace(href_en_no_pro, pos, 5, "/big5/");

	

	langLinks.en = href_en;

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

	langLinks.sc = pro + "//" + hanweb_prefix + href_tc_no_pro;

}





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/');

	

	langLinks.en = href_en;

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

	langLinks.sc = pro + "//" + hanweb_prefix + href_tc_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/');



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

	langLinks.tc = href_tc;

	langLinks.sc = pro + "//" + hanweb_prefix + href_tc_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

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

	var href_tc_no_pro = href_sc_no_pro.substr(pos);



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

	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 src1  = "";

	var src2  = "";

	var href1 = "";

	var href2 = "";

	var icon_home = "";

	var icon_print = "";

	var icon_content = "";



	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";

		icon_home = "ÞV–™
˜";

		icon_print = "RpS";

		icon_content = "îv“";

		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";

		icon_home = "ÞV–™
˜";

		icon_print = "RpS";

		icon_content = "îv“";

		src1 = imgSrc_en;

		src2 = imgSrc_tc;

	}

	else

	{

		kh_get_en_links(langLinks);

		href1 = langLinks.tc;

		href2 = langLinks.sc;

		alt1 = "Traditional Chinese";

		alt2 = "Simplified Chinese";

		icon_home = "Back to UGC Home";

		icon_print = "Print";

		icon_content = "Contents";

		src1 = imgSrc_tc;

		src2 = imgSrc_sc;

	}

		

	str  = '<table cellpadding="0" cellspacing="0" border="0" width="100%" class="FastMenu"><tr><Td width="100%"><img src="images/spacer.gif" border="0" width="10"></td>';

    str += '<td><a href="http://www.ugc.edu.hk" target="_blank" >'; 

	str	+= '<img src="images/back_ugc.jpg" border="0" alt="' + icon_home +'" title="' + icon_home +'" width="26" height="25"></a></td>';

	str += '<td><img src="images/spacer.gif" border="0" width="10"></td>';

    str += '<td><a href="contents.htm" > <img src="images/content1.jpg" border="0" alt="' + icon_content + '" title="' + icon_content + '" width="26" height="25"></a></td>';

    str += '<td><img src="images/spacer.gif" border="0" width="10"></td>';

    str += '<td><a href="javascript:window.print()"><img src="images/print.jpg" border="0" alt="' + icon_print +'" title="' + icon_print +'" width="26" height="25"></a></td>';

    str += '<td><img src="images/spacer.gif" border="0" width="10"></td>';

    str += '<td><a href="' + href1 + '"><img src="' + src1 + '" alt="' + alt1 + '" border="0" width="26" height="25"></a></td>';

    str += '<td><img src="images/spacer.gif" border="0" width="10"></td>';

    str += '<td><a href="' + href2 + '"><img src="' + src2 + '" alt="' + alt2 + '" border="0" width="26" height="25"></a></td>';

	str += '<td><img src="images/spacer.gif" border="0" width="20"></td></tr></table>';



	document.writeln(str);

}



kh_main();



// End of file