$(document).ready(function(){
    $('.c_article_smallimages img').click(function(){
        var src1 = $(this).attr('src');
        var largeImage = $('.c_article_largeimage img:first');
        
        var src2 = largeImage.attr('src');
        var dsa = "dsfaf";
        
        src1 = src1.replace(/=95/g, '=200').replace('=true', '=false');
        src2 = src2.replace(/=200/g, '=95').replace('=false', '=true');
        largeImage.attr('src', src1);
        $(this).attr('src', src2);
    });
});