Global variable tempalte based variable

Hi,

I have self hosted video player and I frequently change theme.

I post my video on the post editor using this code.

<script type="text/javascript">// <![CDATA[
player("container").setup({
	flashplayer: "player.swf",
	file: "video.flv",
	autostart: "true",
	repeat: "always",
	stretching: "exactfit",
	height: 350,
	width: 555
});
// ]]></script>

My problem is that the video size is not always fit to the themes. What I want to do now is to declare a global constant variable that I can use to replace the height and the width value of the above code. This way I can just edit the global variable to suit my current theme.

Where can I declare a global constant variable that I can use in post editor (html).

If there is other way to accomplish this, please comment.

your help is highly appreciated.

Thanks