function createCookie(name, value ) {
  document.cookie = name + "=" + value + "; path=/";
}

function readCookie( name ) {
 var dCookie = document.cookie;
 var pos = dCookie.indexOf( name );
 
 if ( name=="" || pos==-1 )
   return ""; 
 var pos1 = dCookie.indexOf( ';', pos );
 if ( pos1 == -1 )
   pos1 = dCookie.length; 
 return unescape( dCookie.substring(pos+name.length+1,pos1) );
}

function eraseCookie( name ) {
	document.cookie = name + "=" + "; path=/";
}