$(document).ready(function() {
    var x = 1+Math.floor(Math.random()*3);
    if (x == 1){
        $('#banner_flash').flash({swf:'/media/swf/topo2.swf', width:'750', height:'250', params:{wmode:'transparent'}});
    }
    if (x == 2){
        $('#banner_flash').flash({swf:'/media/swf/topo3.swf', width:'750', height:'250', params:{wmode:'transparent'}});
    }
    if (x == 3){
        $('#banner_flash').flash({swf:'/media/swf/topo4.swf', width:'750', height:'250', params:{wmode:'transparent'}});
    }
});