var link = '/play.php';
var ban_do='/banners/ban-468-';
var min = 1;
var max = 7;
var ban_posle='.gif';

var x = 468;
var y = 60;

document.write('<a href="'+ link +'" target="_blank"><img src="'+ ban_do + (Math.floor(Math.random()*(max-min+1))+min) + ban_posle +'" width="'+x+'" height="'+y+'"/></a>');