/***** funzione per la gestione dei cookie *****/

function scriviCookie(name,value) {
   var argv=scriviCookie.arguments;
   var argc=scriviCookie.arguments.length;
   var path=(argc>2)?argv[2]:null;
   var domain=(argc>3)?argv[3]:null;
   var expires=(argc>4)?argv[4]:null;
   var secure=(argc>5)?argv[5]:false;

   document.cookie=name+"="+escape(value)+
   ((expires == null) ? "" : ("; expires=" +expires.toGMTString()))
   +
   ((path == null) ? "" : ("; path=" +path))
   +
   ((domain == null) ? "" : ("; domain=" +domain()))
   +
   ((secure == true) ? "; secure" :"");
}

function leggiCookie(name) {
   var arg=name +"=";
   var alen=arg.length;
   var clen=document.cookie.length;
   var i=0;
   while (i<clen) {
       var j=i+alen;
       if (document.cookie.substring(i,j)==arg)
           return leggiValCookie(j);
       i=document.cookie.indexOf(" ",i)+1;
       if (i==0) break;
   }
   return null;
}

function leggiValCookie(offset) {
   var endstr=document.cookie.indexOf(";",offset);
   if (endstr==-1)
       endstr=document.cookie.length;
       return unescape (document.cookie.substring(offset,endstr));
}

function cancellaCookie(name) {
   var exp=new Date();
   exp.setTime(exp.getTime()-1);
   var cval=leggiCookie(name);
   document.cookie=name+"="+cval+"; expires="+exp.toGMTString();
}