zeroram

I didnt want to start a new thread since my problem is almost the same. I created an advertiser, added 1 campaign, added 1 HTML code banner, created a website, created zones, linked the banners to the zone and when I go and grab my invocation code for a particular zone, inserted into the website i want the ad to show up and it doesn't show up. i used javascript code, iframe code and nothing show... any idea what could be wrong?