function createCookie( name, value, days) 
{
	if ( days ) 
	{
		var date = new Date();
		date.setTime( date.getTime() + ( days * 24 * 60 * 60 * 1000 ) );
		var expires = "; expires=" + date.toGMTString();
	}
	else var expires = "";
	document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie( name ) 
{
	var nameEQ = name + "=";
	var ca = document.cookie.split( ';' );
	for ( var i=0; i < ca.length; i++ ) 
	{
		var c = ca[ i ];
		while ( c.charAt(0) == ' ' ) c = c.substring( 1, c.length );
		if ( c.indexOf( nameEQ ) == 0 ) return c.substring( nameEQ.length, c.length );
	}
	return null;
}

function eraseCookie( name ) 
{
	createCookie( name, "", -1 );
}