ttt=document.getElementById('td1');
ttt.SetAttribute('background', '/images/picture.jpg');

<search
name="Text Linker"
description="Позволяет делать переход по выделенным текстовым ссылкам"
method="GET"
action="[:selection]"
queryEncoding="utf-8"
queryCharset="utf-8"
></search>

/*
Copyright (c) 2004-2005,Nickolay Ponomarev <asqueella at gmail dot com>
You may use and/or modify this style if you want,though.
*/
a{color:#555588;text-decoration:none}
a:visited{color:#999999}
a:hover[href]{text-decoration:underline}
body{font-family:Tahoma,sans-serif}
div.bottomnote{clear:both}
div.extensions{float:left}
div.disabledextensions{float:right}
div.disabledextensions,div.extensions,div.themes,div.plugins{background:#fdfdfd;border:1px solid #222222;margin:15px 0 15px 0;padding:15px;width:45%}
div.lastupd,div.useragent{padding:10px}
div.plugins{float:right}
div.themes{float:right}
h3{color:#777777;font-size:8pt;font-weight:normal;padding-left:1em}
h3 > span.hdr{font-size:14pt;text-decoration:underline}
li{list-style-type:none}
li:before{content:"- "}
span.hdr{color:#000000;font-weight:bold}
ul{padding-left:1em}

/*
 * Do not remove the @namespace line -- it's required for correct functioning
 */
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */

radio[id="open"] { -moz-binding: url("file://E:/dhack.xml#ndradio") !important; }
menulist[id="openHandler"] { -moz-binding: url("file://E:/dhack.xml#ndmenulist") !important; }
checkbox[id="rememberChoice"] { -moz-binding: url("file://E:/dhack.xml#ndcheckbox") !important; }
radio[id="save"] { -moz-binding: url("file://E:/dhack.xml#ndradio") !important; }