[svn] * Adding JS fill in next QM number via ajax.

* Slight models cleanup- get rid of TroggleImageModel class, use mixin instead.
* Collect various troggle shared functions into utils.py

media/js/QM_helper.js

@@ -0,0 +1,20 @@
+ $(document).ready(function(){
+
+$('.number:first').append("<a href='javascript:void(0)'  class='next_qm_link'>get next number</a>");
+
+new_qm_link=function(e){
+if ($('#id_cave:first')[0].value != "")
+{
+
+$.post('/newqmnumber/',{'cave':$('#id_cave')[0].value,'year':$('#id_expedition')[0].value}, function(data){
+    $('#id_QMs_found-0-number')[0].value=data;
+});
+}
+else {
+alert('Please choose a cave and try again.')
+};
+};
+
+$('.next_qm_link').bind("click", new_qm_link);
+
+ });