Index: http/javascripts/mod_digitize_tab.php
===================================================================
--- http/javascripts/mod_digitize_tab.php	(revision 1725)
+++ http/javascripts/mod_digitize_tab.php	(working copy)
@@ -853,7 +853,7 @@
 }
 
 function isInteger(str) {
-	if (str.match(/^\d+$/)) {
+	if (str.match(/^\d*$/)) {
 		return true;
 	}
 	return false;