javascript detect element as null or undefine

[programAngel]

Hi, I have the following script in the bottom of my page:

<script type="text/javascript">
	if (navigator.appName.indexOf('Microsoft Internet Explorer')!=-1){
		document.getElementById("fm_banner-diyur-plus1_704354692").style.top="81px";
	}	
</script>

I also have an object with the exact id, before this line of code:

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
			id="fm_banner-diyur-plus1_704354692"
			class="flashmovie"
			width="673"
			height="138">
	<param name="movie" value="http://barzilaymor.co.il/diur-plus.co.il/wp-content/uploads/2012/03/banner-diyur-plus1.swf" />
	<!--[if !IE]>-->
	<object	type="application/x-shockwave-flash"
			data="http://barzilaymor.co.il/diur-plus.co.il/wp-content/uploads/2012/03/banner-diyur-plus1.swf"
			name="fm_banner-diyur-plus1_704354692"
			width="673"
			height="138">
	<!--<![endif]-->
		
<p><a href="http://adobe.com/go/getflashplayer"><img src="http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get Adobe Flash player" /></a></p>

	<!--[if !IE]>-->
	</object>
	<!--<![endif]-->
</object>

And this code is before the script.

Yet when I load the page:
http://barzilaymor.co.il/diur-plus.co.il/

When I load it in IE 9 I get following message:

SCRIPT5007: Unable to get value of the property 'style': object is null or undefined
diur-plus.co.il, line 487 character 3

How come?

After all I do have an element with the id of fm_banner-diyur-plus1_704354692?

and why would it have an style property?
After all, all element have supposed to have style property?

[programAngel]

I have changed my script, now it is:

document.getElementsByTagName('object')[1].style.top="81px";

when I load it in IE, I still get:

diur-plus.co.il
SCRIPT5007: Unable to get value of the property 'style': object is null or undefined
diur-plus.co.il, line 487 character 3

but when I run it from the console, it does work.

Why is that?

[007Julien]

Is your object positioned ? Without a position:absolute or relative for the flashmovie class your object can't be positioned !

[Troy III]

You are confusing IDs with Name properties

Since element IDs are supposed to be a unique accessory-thing across the whole of the document -(meaning) only one ID may correspond to a certain person in the whole world -otherwise that ID is no ID at all; it's a useless crap; a forgery; and simply doesn't qualify for an ID anymore: the answer is you should learn more on the fundamental notions that apply far beyond this digital corner of the world!

[Troy III]

But, you can do yourself a cross-browser favor with a proper code like:

<object width=300 height=150 
id=fm_banner-diyur-plus1_704354692
data=http://barzilaymor.co.il/diur-plus.co.il/wp-content/uploads/2012/03/banner-diyur-plus1.swf>
</object>