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 );
}