function registrati(lang) {
if (navigator.appName!='Microsoft Internet Explorer') str="screenX=0,screenY=0,outerWidth=180,outerHeight=155,status=no,toolbar=no,menubar=no,location=no,scrollbars=no,resizable=no";
else str="left=0,top=0,width=180,height=140,status=no,resizable=no,toolbar=no,menubar=no,location=no,scrollbars=no";
window.open ('/registrazione.asp?currlang='+lang,'zoom',str);
}
<!-- 
function MM_openBrWindow(theURL,winName,features) { //v2.0 
PageIndex2=document.form2.select2.selectedIndex 
theURL=document.form2.select2.options[PageIndex2].value;
features="fullscreen=yes,scrollbars=no;toolbar=no,resizable=yes,status=no"
window.open(theURL,winName,features); 
} 
//--> 
<!-- 
function openNewWindow(URLtoOpen, windowName, windowFeatures) { 
  newWindow=window.open(URLtoOpen, windowName, windowFeatures);
}//--> 

function abb() {
if (navigator.appName!='Microsoft Internet Explorer') str="";
else str="";
window.open ('http://www.abbonamenti.it/p.asp?p=1248','zoom',str);
}

function abbe() {
if (navigator.appName!='Microsoft Internet Explorer') str="";
else str="";
window.open ('http://www.abbonamenti.it/estero/est-ing-rivista.asp?Vpccdtest=527','zoom',str);
}