function getWidth() {
  var myWidth = 640;
  if (screen.width > 0) {
	myWidth = screen.width + " ";
	myWidth = myWidth.substring(0,2);
  }
  return myWidth;
}

function Get_Cookie( name ) {

var start = document.cookie.indexOf( name + "=" );
var len = start + name.length + 1;
if ( ( !start ) &&
( name != document.cookie.substring( 0, name.length ) ) )
{
return null;
}
if ( start == -1 ) return null;
var end = document.cookie.indexOf( ";", len );
if ( end == -1 ) end = document.cookie.length;
return unescape( document.cookie.substring( len, end ) );
}

function getBrowserVersionID() {

// Imposta la parte dell'ID unico per il tuo sito di 5 caratteri
var ID_prefix = "ircgt" + getWidth();

if (/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ //test for Firefox/x.x or Firefox x.x (ignoring remaining digits);
 var ffversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 if (ffversion>=3)
  return "ff3" + ID_prefix;
 else if (ffversion>=2)
  return "ff2" + ID_prefix;
 else if (ffversion>=1)
  return "ff1" + ID_prefix;
 else
  return "ffu" + ID_prefix;
}
else if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for MSIE x.x;
 var ieversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 if (ieversion>=8)
    return "ie8" + ID_prefix;
 else if (ieversion>=7)
    return "ie7" + ID_prefix;
 else if (ieversion>=6)
    return "ie6" + ID_prefix;
 else if (ieversion>=5)
    return "ie5" + ID_prefix;
 else
    return "ieu" + ID_prefix;
}
else if (/Opera[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ //test for Opera/x.x or Opera x.x (ignoring remaining decimal places);
 var oprversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 if (oprversion>=10)
  return "o10" + ID_prefix;
 else if (oprversion>=9)
  return "op9" + ID_prefix;
 else if (oprversion>=8)
  return "op8" + ID_prefix;
 else if (oprversion>=7)
  return "op7" + ID_prefix;
 else
  return "opu" + ID_prefix;
}
else if (navigator.userAgent.toLowerCase().indexOf('chrome') > -1){
  return "chu" + ID_prefix;
}
else if (navigator.userAgent.toLowerCase().indexOf('safari') > -1){
  return "sau" + ID_prefix;
}
else {
  return "bru" + ID_prefix;	
}
return "";	
}