ads aren't showing

[koedoe]

ok i'm sure that this questino is asked before but i can't find it in the forum so here i go:

i have a simple html page and want to place 3 ads with this ad code

this is the leaderboard

<script type="text/javascript"><!--
google_ad_client = "pub-#*$!#*$!xxxxxxxxxx";
google_ad_width = 728;
google_ad_height = 90;
google_ad_format = "728x90_as";
google_ad_channel ="";
//--></script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

if i place 1 ad, then it shows perfectly but as soon as i place a second ad, it isn't showing it only shows the first ad and the same goes for AD number 3.

so is there something wrong in my html code of what.
thnx in advance

[caspita]

I think this is an issue of poor ads inventory... you may see this also if for example you use a x4 ads format and you use to get 1, 2 or 3 and a few times up to 4 .. it means that the inventory of adsin your niche is too low. Now imagine using 3 times x4 ads.

Be sure of that first.

[koedoe]

ok, i tried a other ad, the button ad.
if i place 3 buttons ads after another i have no problem all 3 adds show. but as soon i use a sky scrayper or someting i'm into trouble

[caspita]

I think your last testing confirms that there are not as many Ads as you may want to publish.