Plugin for Image above Post area

[Former Member]

 I have the option of adding images inside the post area with this code.
Could someone please create a plugin?

<script type="text/javascript">

<!--

/*

Replace "Line" In Posts With Image

Coded By Moose

Requested By Kapt~`'-

*/

var postimg = "http://i27./c160/Chrissy_66/Stuff%20for%20Board/Winter-Christmas/snowline.gif";

if(location.href.match(/action=display/)){

var td = document.getElementsByTagName('td');

for(t=0;t<td.length;t++){

if(td[t].colSpan == "3" && td[t].vAlign == "top" && td[t].firstChild.className == "hr"){

var img = document.createElement('img');

var center = document.createElement('center');

img.src = postimg;

img.border = "0";

center.appendChild(img);

var br = document.createElement('br');

td[t].replaceChild(br,td[t].firstChild);

td[t].insertBefore(center,br);

}}}

//-->

</script>

Thanks 
Chrissy