diff --git a/javascript/SubsitesTreeDropdownField.js b/javascript/SubsitesTreeDropdownField.js
index 6657fa3..b1f43ce 100644
--- a/javascript/SubsitesTreeDropdownField.js
+++ b/javascript/SubsitesTreeDropdownField.js
@@ -14,12 +14,11 @@ SubsitesTreeDropdownField.prototype = {
 	},
 	
 	ajaxGetTree: function(after) {
-		// This if block is necessary to maintain both 2.2 and 2.3 support
 		var baseURL = this.helperURLBase();
-		if(baseURL.match('action_callfieldmethod')) var ajaxURL =  baseURL+ '&methodName=gettree&forceValues=' + this.inputTag.value;
-        else var ajaxURL =  baseURL+ 'gettree?forceValues=' + this.inputTag.value;
+		// Can't force value because it might be on a different subsite!
+		var ajaxURL =  baseURL+ 'gettree?forceValues=' + 0; //this.inputTag.value;
 		
-		// Customized: Append subsiteid (evaluated in SubsitesVirtualPage.php)
+		// Customised: Append subsiteid (evaluated in SubsitesVirtualPage.php)
 		ajaxURL += '&' + this.inputTag.name + '_SubsiteID=' + parseInt(this.subsiteID());
 		
 		ajaxURL += $('SecurityID') ? '&SecurityID=' + $('SecurityID').value : '';
@@ -37,11 +36,8 @@ SubsitesTreeDropdownField.prototype = {
 		var ul = this.treeNodeHolder();
 		ul.innerHTML = ss.i18n._t('LOADING');
 		
-		// This if block is necessary to maintain both 2.2 and 2.3 support
 		var baseURL = this.options.dropdownField.helperURLBase();
-
-        if(baseURL.match('action_callfieldmethod')) var ajaxURL =  baseURL+ '&methodName=getsubtree&SubtreeRootID=' + this.getIdx();
-        else var ajaxURL =  baseURL+ 'getsubtree?SubtreeRootID=' + this.getIdx();
+		var ajaxURL =  baseURL+ 'getsubtree?SubtreeRootID=' + this.getIdx();
 		
 		// Find the root of the tree - this points to a list item in the tree, not the root div we actually want
 		// @todo: We should be using framework API calls to find the tree
@@ -58,4 +54,4 @@ SubsitesTreeDropdownField.prototype = {
 		});
 	}
 }
-SubsitesTreeDropdownField.applyTo('div.SubsitesTreeDropdownField');
\ No newline at end of file
+SubsitesTreeDropdownField.applyTo('div.SubsitesTreeDropdownField');