Index: t3lib/class.t3lib_befunc.php
===================================================================
--- t3lib/class.t3lib_befunc.php	(Revision 8878)
+++ t3lib/class.t3lib_befunc.php	(Arbeitskopie)
@@ -2487,15 +2487,12 @@
 	 * @return	string		HTML content for a help icon/text
 	 */
 	public static function helpTextIcon($table, $field, $BACK_PATH, $force = 0) {
-		global $TCA_DESCR, $BE_USER;
-
-		$onClick = 'vHWin=window.open(\''.$BACK_PATH.'view_help.php?tfID='.($table.'.'.$field).'\',\'viewFieldHelp\',\'height=400,width=600,status=0,menubar=0,scrollbars=1\');vHWin.focus();return false;';
-		if (is_array($TCA_DESCR[$table]) && is_array($TCA_DESCR[$table]['columns'][$field]) && (isset($BE_USER->uc['edit_showFieldHelp']) || $force)) {
-			if ($BE_USER->uc['edit_showFieldHelp'] == 'icon') {
+		if (is_array($GLOBALS['TCA_DESCR'][$table]) && is_array($GLOBALS['TCA_DESCR'][$table]['columns'][$field]) && (isset($GLOBALS['BE_USER']->uc['edit_showFieldHelp']) || $force)) {
+			if ($GLOBALS['BE_USER']->uc['edit_showFieldHelp'] == 'icon') {
 				$text = self::helpText($table, $field, $BACK_PATH, '');
 				$text = '<span class="typo3-csh-inline">' . $GLOBALS['LANG']->hscAndCharConv($text, FALSE) . '</span>';
 			}
-			return '<a class="typo3-csh-link" href="#" onclick="'.htmlspecialchars($onClick).'">' . t3lib_iconWorks::getSpriteIcon('actions-system-help-open', array('class' => 'typo3-csh-icon')) . $text.'</a>';
+			return '<a class="typo3-csh-link" href="" rel="' . $table . '|' . $field . '">' . t3lib_iconWorks::getSpriteIcon('actions-system-help-open', array('class' => 'typo3-csh-icon')) . $text . '</a>';
 		}
 	}
 
Index: typo3/js/common.js
===================================================================
--- typo3/js/common.js	(Revision 8878)
+++ typo3/js/common.js	(Arbeitskopie)
@@ -24,7 +24,7 @@
 // Please make sure that prototype.js is loaded before loading this
 // file in your script, the responder is only added if prototype was loaded
 
-if (Prototype) {
+if (typeof Prototype != 'undefined') {
 	// adding generic a responder to use when a AJAX request is done
 	Ajax.Responders.register({
 		onCreate: function(request, transport) {
@@ -100,3 +100,22 @@
 		}
 	}
 };
+
+/** opens up a popup window with the context sensitive help
+  * the CSH link (created in t3lib_befunc::helpTextIcon) includes a rel="table|field"
+  * value, the backpath is set in typo3/template.php::getHelptextCode()
+  */
+TYPO3.Help = {
+	backPath: '',
+	popupUrl: 'view_help.php?tfID=',
+	openPopup: function(anchorEl) {
+		var data = anchorEl.getAttribute('rel').split('|');
+		var table = data[0];
+		var field = data[1];
+		window.open(this.backPath + this.popupUrl + table + '.' + field, 'viewFieldHelp', 'height=400,width=600,status=0,menubar=0,scrollbars=1').focus();
+		return false;
+	}
+};
+
+
+
Index: typo3/template.php
===================================================================
--- typo3/template.php	(Revision 8878)
+++ typo3/template.php	(Arbeitskopie)
@@ -743,6 +743,9 @@
 		if (!$GLOBALS['BE_USER']->uc['disableTabInTextarea']) {
 			$this->loadJavascriptLib('tab.js');
 		}
+		
+			// include the JS for the Context sensitive help
+		$this->getHelptextCode();
 
 			// Get the browser info
 		$browserInfo = t3lib_utility_Client::getBrowserInfo(t3lib_div::getIndpEnv('HTTP_USER_AGENT'));
@@ -1562,6 +1565,28 @@
 
 
 	/**
+	 * This loads everything needed for the CSH (help system)
+	 * 
+	 * @return void
+	 */
+	protected function getHelptextCode() {
+		$this->pageRenderer->addJsFile($this->backPath . 'js/common.js');
+		$this->pageRenderer->loadExtJS();
+		$this->pageRenderer->addExtOnReadyCode('
+		if (typeof TYPO3.Help != "undefined") {
+			TYPO3.Help.backPath = "' . $this->backPath . '";
+			var itms = Ext.DomQuery.select("a.typo3-csh-link");
+			if (itms && itms.length) {
+				itms.each(function(el) {
+					Ext.get(el).on("click", function(evt) { TYPO3.Help.openPopup(el); evt.stopEvent(); });
+				});
+			}	
+		}
+	');
+	}
+
+
+	/**
 	 * Creates a tab menu from an array definition
 	 *
 	 * Returns a tab menu for a module