[monolithed]

<script type="text/javascript">
window.onload = function(){
	document.getElementsByName('copy')[1].onclick = function(){
    var text = document.getElementsByName('copy')[0].value;
	if(window.clipboardData) window.clipboardData.setData("Text", text); //IE
   else if(window.netscape) { //Netscape
		try {
			if(netscape.security.PrivilegeManager.enablePrivilege)
	   			netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
	   			//netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');
	   			//netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserWrite")
		}
        catch(event) {
        	alert('Настройка безопасности браузера не позволяет обращаться к буферу обмена!\n'+event);
            return;
        }
	    var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
	    if(!clip) return;
	    var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
	    if(!trans) return;
	    trans.addDataFlavor('text/unicode');
	    var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString), 
        copy = text;
	    str.data = copy;
	    trans.setTransferData("text/unicode", str, copy.length*2);
	    if(!clip) return false;
	    clip.setData(trans, null, Components.interfaces.nsIClipboard.kGlobalClipboard);
    }
    alert("В буфер обмена сохранено:\n" + text);
    return false;
    };
};
</script>
<input type="text" value="text" name="copy" />
<input type="submit" value="copy" name="copy" />