--- a/install.php	Mon Jul 02 15:17:54 2007 -0400
+++ b/install.php	Mon Jul 02 20:33:57 2007 -0400
@@ -754,7 +754,7 @@
       {
         var frm = document.forms.login;
         ret = true;
-        if(frm.admin_user.value.match(/^([A-z0-9_\-\.]+)$/g))
+        if(frm.admin_user.value.match(/^([A-z0-9 \-\.]+)$/g))
         {
           document.getElementById('s_user').src = 'images/good.gif';
         }