// Toggle Display of BibTeX
function toggleBibtex(articleid) {
    var bib = document.getElementById('bib_'+articleid);
    if (bib) {
        if(bib.className.indexOf('bibtex') != -1) {
            bib.className.indexOf('noshow') == -1?bib.className = 'bibtex noshow':bib.className = 'bibtex';
        }
    } else {
        return;
    }
}