JavaScript response check?

[arnage]

Is there any way to check is script getting any response from url source and if there isn't any, not to show anything?
The problem is that when there isn't any, the script is forcing custom 404 error page to download.
This is all whats in question, its about ads.

<script type="text/javascript" src="http://site.com/page/show_ads.js">
</script>

[GumSlone]

in the show_ads.js
define a variable, ie, var response = 1;

and in the page where you load the show_ads.js put:
if (typeof( response ) !== 'undefined')
{
//do something
}

[kevk3v]

Jquery way

$.ajax({
url:'http://site.com/page/show_ads.js',
type:'HEAD',
error: function()
{
//file not exists
},
success: function()
{
//file exists
}
});

[arnage]

I don't get you guys, this is all i have.

<script type="text/javascript"><!--
google_ad_client = "SomeNumbers";
google_ad_slot = "SomeNumbers";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

I don't have access to script show_ads.js.

-----------

And if i do something like this is it legal? Are they gonna ban this client? Its my friends site so i have to be careful.

 $response = implode('', file('http://pagead2.googlesyndication.com/pagead/show_ads.js'));

 if (!empty($response)) {

 echo '<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>';

 } 

Is it gonna work at all?

---------------

It doesn't.

[kevk3v]

Well then GumSlone gave a good solution

Try

if(typeof a.google_allow_expandable_ads != 'undefined')
{
alert('Response successful');
}

Google will always give a response for that js file, and if you see blank ads, you have to wait, you have the correct code.

[arnage]

I don't have a clue about javascript and showing ads.

[kevk3v]

I didn't either lol, but jquery is forcing me to learn it and its really easy so far

[metulj]

I don't get you guys, this is all i have.

<script type="text/javascript"><!--
google_ad_client = "SomeNumbers";
google_ad_slot = "SomeNumbers";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

I don't have access to script show_ads.js.

-----------
.....................

will it help if you have ...//show_ads.js saved localy ?

[arnage]

I don't know is it gonna be readable for google ads then. Maybe even ban him...

[GumSlone]

for google ads leave the ads the way they are with the 404 error, after some time there will appear some ads, i guess that google needs some time to collect informations about the page where the ads are placed to show its keyword targeted ads there.

[arnage]

Ok, thanks for explanation.