function get_lemma() {
if (navigator.appName.indexOf("Explorer") == -1 | (navigator.appVersion.indexOf("Mac") != -1 && navigator.appName.indexOf("Explorer") != -1)) var testo = document.getSelection();//Netscape mac pc e IE solo Mac
else var testo = document.selection.createRange().text;//IE su win32
if (testo.length > 1) window.location='pervipedia.asp?'+testo;
}