var Monumentos = new Array( 30 )

var pos = Math.round( Math.random() * ( Monumentos.length - 1 ) ) + 1

if ( pos > 30 || pos < 0 ) pos = 1

function mostraMonumento(){
   document.writeln( "<img width=148 height=98 style='border:1px solid #000000' src='Galerias/Monumentos/" + pos + "_mini.jpg'>" )
}