and use that to show/hide save button and provide useful title
<h1>Prijava rada</h1>
-<div ng:controller="Work" ng:init="$window.$root = this">
+<div ng:controller="Work" ng:init="$window.$root = this; changes = 0" ng:eval="changes = changes + 1">
<h2>Vrsta rada:</h2>
<input type="radio" name="work.type" value="symposium"> Simpozij
<textarea name="work.abstract" cols="50" rows="5"></textarea> <br/>
<span ng:show="$invalidWidgets.visible() == 0">
- <input type="submit" value="Save" ng:click="work.symposium_id=symposium._id; save();">
+ <input type="submit" value="Save" ng:click="work.symposium_id=symposium._id; save();" ng:show="changes" title="{{changes}} changes">
<input type="reset" value="Novi rad" ng:click="reset()" ng:show="work && work._id">
</span>