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json_url = "/alerts.json"
page_visited = false
starting_size = 0
update = (alerts) ->
if !page_visited
starting_size = alerts.length
page_visited = true
if alerts.length > starting_size
$("#alerts-ajax").css("display", "inline");
return
setTimeout (->
$.ajax(url: json_url).done update
return
), 2000
# Now kick off the whole process
window.onload = ->
$.ajax(url: json_url).done update
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