Multiple render text in jquery rails

Hi,

For one action of user based on condition i want to render different
texts. So how do i achieve it through jquery?
For example:

A simple posting message application:

On post button i have a post method which has security checks and other
server side checks like :

===========================
if message_text.nil? or message_text.empty? or message_text.length > 140
post_validation_check=true
respond_to do |format|
format.html {
render :text=> “
Please enter message upto 140
characters

}
format.xml {
render :xml=>hash_map_for_xml.to_xml(:root => “mb”)
}
end

Normal post.js.erb is:
$("#div3").html("<%= escape_javascript render ‘/messages/timeline’ %>");

which works if all is ok but how do i render messages like these when
user enters message greater than 140 characters? I have javascript
checks for them but i need these checks in case user enters it through
firebug skipping javascript.

When i see in firebug i do get the response but it is not painted on
browser as it doesnt know where to do it.

I feel i’m missing out soemthing very simple. Please let me know how can
this be achieved?

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