// >>> Language click effects
    for(langClickNum = 1; langClickNum < langList.length; langClickNum++) {

        $('#lang'+langList[langClickNum]).click(function() {
            if (!langSelect[langClickNum]) {

                clrSearch();
                clrLang();
                langHide();

                $('#lang'+langList[langClickNum]).addClass('langCheck');
                $('.itemLang'+langList[langClickNum]).show();
                langSelect[langClickNum] = true;
            }
            else {
                clrLang();
                langShow();
            }
        });

    }

$('#lang'+langList[1]).click(function() {
        if (!langSelect[1]) {

            clrSearch();
            clrLang();
            langHide();

            $('#lang'+langList[1]).addClass('langCheck');
            $('.itemLang'+langList[1]).show();
            langSelect[1] = true;
        }
        else {
            clrLang();
            langShow();
        }
});

for(x = 1; x < langList.length; x++) {
    (function(){
        var langClickNum = x;
        $('#lang'+langList[langClickNum]).click(function() {//... rest of your code}
    })();
}

$('#lang'+langList[langClickNum]).click(function(langClickNum) {
    return function() {
        if (!langSelect[langClickNum]) {

            clrSearch();
            clrLang();
            langHide();

            $('#lang'+langList[langClickNum]).addClass('langCheck');
            $('.itemLang'+langList[langClickNum]).show();
            langSelect[langClickNum] = true;
        }
        else {
            clrLang();
            langShow();
        }
    }
});

<script type="text/javascript">
    jQuery(document).ready(function () {
        var _LangList = ['lang1', 'lang2', 'lang3', 'lang4', 'lang5'];
        var _iCurrLangIndex = 0;
        var _iIndex = 0;
        jQuery.each(jQuery('#lang_list').children(), function () {
            var _oCurrLangObj = jQuery(this).click(function () {
                var __iThisItemsIndex = parseInt(jQuery(this).attr('data-lang-index'));
                // Code Here
            }).attr('data-lang-index', _iIndex++);
        });
    });
</script>

<div id="lang_list">
    <div id="lang0"></div>
    <div id="lang1"></div>
    <div id="lang2"></div>
    <div id="lang3"></div>
    <div id="lang4"></div>
</div>