// ajax the form
function post_comment(url){
	var formhash=$('comment_form').serialize(true); 
	formhash.ajax=1; 
	new Ajax.Updater('comments_c',url,{parameters:formhash,onLoading:function(request){showIndicator(4)},onComplete:function(request){hideIndicator(4);Effect.ScrollTo('last_comment')}});
}