function rand( min, max ) {
if( max ) {
return Math.floor(Math.random() * (max - min + 1)) + min;
} else {
return Math.floor(Math.random() * (min + 1));
}
}
function showAd(num)
{
if (num == 1)
{
document.write('
');
}
else if (num==2)
{
document.write('
');
}
else if (num==3)
{
document.write('
');
}
else if (num==4)
{
document.write('
');
}
}
showAd(rand(1,4));