MediaWiki:Common.js

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/* <pre> */
/* Any JavaScript here will be loaded for all users on every page load. */

originalHeaderRow = $("tr:first", this);
originalHeaderRow.before(originalHeaderRow.clone());

// original css rules and stuff

clonedHeaderRow.children().each( function( index ) {
    $(this).append("<div class='widthFix'></div>");
    $(this).css("padding-left", "0");
    $(this).css("padding-right", "0");
    $('.widthFix', this).width( originalHeaderRow.children().get( index ).clientWidth );
});