RJS error:TypeError: arrow is null

when i tried to click a button called option uit is showing a pop up
with error "RJS error:TypeError: arrow is null"

when i click ok then it shows what is given below.pls help me

crm.flick("empty", "toggle");
crm.hide_form("create_account");
crm.flip_form("options");
$("options").update("<p>\n <div class=\"close\" onclick=\"new
Ajax.Request('/accounts/options', {asynchronous:true, evalScripts:true,
method:'get', parameters:{ cancel: true }})\"
onmouseout=\"this.style.background='lightblue'\"
onmouseover=\"this.style.background='lightsalmon'\" title=\"Close
form\">x</div>\n <input id=\"account_user_id\"
name=\"account[user_id]\" type=\"hidden\" value=\"2\" />\n Sort
accounts by <a href=\"#\" id=\"sort_by\">date created</a>.\n Show <a
href=\"#\" id=\"per_page\">20</a> accounts per page using <a href=\"#\"
id=\"outline\">long</a> format.\n</p>\n<p></p>\n<script>\n new
crm.Menu({\n trigger : \"sort_by\",\n fade : 0.5,\n
appear : 0.5,\n menu_items: [ { name: \"Name\", on_select:
function() {if ($('sort_by').innerHTML != 'name') { new
Ajax.Request('/accounts/redraw', {asynchronous:true, evalScripts:true,
onComplete:function(request){$('loading').hide()},
onLoading:function(request){$('sort_by').update('name');
$('loading').show()}, parameters:{ sort_by: 'name' }}); }}},{ name:
\"Date Created\", on_select: function() {if ($('sort_by').innerHTML !=
'date created') { new Ajax.Request('/accounts/redraw',
{asynchronous:true, evalScripts:true,
onComplete:function(request){$('loading').hide()},
onLoading:function(request){$('sort_by').update('date created');
$('loading').show()}, parameters:{ sort_by: 'created_at' }}); }}},{
name: \"Date Updated\", on_select: function() {if
($('sort_by').innerHTML != 'date updated') { new
Ajax.Request('/accounts/redraw', {asynchronous:true, evalScripts:true,
onComplete:function(request){$('loading').hide()},
onLoading:function(request){$('sort_by').update('date updated');
$('loading').show()}, parameters:{ sort_by: 'updated_at' }}); }}} ]\n
});\n new crm.Menu({\n trigger : \"per_page\",\n fade :
0.5,\n appear : 0.5,\n width : 50,\n menu_items: [ {
name: \"10\", on_select: function() { if ($('per_page').innerHTML !=
'10') { new Ajax.Request('/accounts/redraw', {asynchronous:true,
evalScripts:true, onComplete:function(request){$('loading').hide()},
onLoading:function(request){$('per_page').update('10');
$('loading').show()}, parameters:{ per_page: '10' }}); } } },{ name:
\"20\", on_select: function() { if ($('per_page').innerHTML != '20') {
new Ajax.Request('/accounts/redraw', {asynchronous:true,
evalScripts:true, onComplete:function(request){$('loading').hide()},
onLoading:function(request){$('per_page').update('20');
$('loading').show()}, parameters:{ per_page: '20' }}); } } },{ name:
\"30\", on_select: function() { if ($('per_page').innerHTML != '30') {
new Ajax.Request('/accounts/redraw', {asynchronous:true,
evalScripts:true, onComplete:function(request){$('loading').hide()},
onLoading:function(request){$('per_page').update('30');
$('loading').show()}, parameters:{ per_page: '30' }}); } } },{ name:
\"50\", on_select: function() { if ($('per_page').innerHTML != '50') {
new Ajax.Request('/accounts/redraw', {asynchronous:true,
evalScripts:true, onComplete:function(request){$('loading').hide()},
onLoading:function(request){$('per_page').update('50'); $('loading').sh

when i tried to click a button called option uit is showing a pop up
with error "RJS error:TypeError: arrow is null"

Hard to tell for sure from this, but I'd guess that the RJS is trying
to manipulate a page element with id arrow but there isn't anything on
the page with that ID.

Fred