function setvis(id, vis) {
    if(document.layers){	   //NN4+
        document.layers[id].visibility = vis ? "show" : "hide";
    }
    else if(document.getElementById) {	  //gecko(NN6) + IE 5+
        var obj = document.getElementById(id);
        obj.style.visibility = vis ? "visible" : "hidden";
    }
    else if(document.all){	// IE 4
        document.all[id].style.visibility = vis ? "visible" : "hidden";
    }
}

/* Next two functions  Used to display the bibtex entries **/
function showBibtex(id) {
    setvis(id, true);
}

function hideBibtex(id) {
  setvis(id, false);
}