headertop = new Array(2);
                                
headertop[0] = "<a href = 'http://www.zesto.com.ph/'><img src='http://www.zesto.com.ph/zestoimgs/headerb.jpg' alt='Zest-O Corporation' /></a>";

headertop[1] = "<a href = 'http://www.zesto.com.ph/'><img src='http://www.zesto.com.ph/zestoimgs/header02b.jpg' alt='Zest-O Corporation' /></a>";

headertop[2] = "<a href = 'http://www.zesto.com.ph/'><img src='http://www.zesto.com.ph/zestoimgs/header03b.jpg' alt='Zest-O Corporation' /></a>";

index = Math.floor(Math.random() * headertop.length);
                                
document.write(headertop[index]);