var index = 0;

banners = new Array();



banners[ index++ ] = '<a href="http://www.interdesa.com/radioxinternet.shtml"><IMG  width="468" height="60" alt="Transmisión de radio por Internet por medio de SHOUTcast para WinAmp, Windows Media Player, RealOne y QuickTime" border="0" src="http://www.biblioteca.co.cr/img/banner-radio-468x60.gif"></a>';



//banners[ index++ ] = '<a href=""><IMG  width="468" height="60" alt="comment" border="0" src=""></a>';



function RandomCero( N )

{

  return Math.floor( N * Math.random() );

}



var num = RandomCero( banners.length );

document.write( banners [ num ] );