Index: admin_templates/tree.tpl
===================================================================
--- admin_templates/tree.tpl	(revision 15165)
+++ admin_templates/tree.tpl	(working copy)
@@ -40,7 +40,7 @@
 	}
 </script>
 
-<script src="js/tree.js"></script>
+<script type="text/javascript" src="<inp2:m_Compress files='js/tree.js'/>"></script>
 
 <table style="height: 100%; width: 100%; border-right: 1px solid #777; border-bottom: 1px solid #777;">
 	<tr>
Index: kernel/application.php
===================================================================
--- kernel/application.php	(revision 15165)
+++ kernel/application.php	(working copy)
@@ -1173,12 +1173,8 @@
 			$this->HTML = ob_get_clean() . $this->HTML;
 		}
 
-		$language = $this->recallObject('lang.current');
-		/* @var $language LanguagesItem */
+		$this->setContentType();
 
-		// don't replace header if some tag (e.g. XMLTemplate) already set it to something else
-		header('Content-type: text/html; charset=' . $language->GetDBField('Charset'), false);
-
 		if ( $this->UseOutputCompression() ) {
 			$compression_level = $this->ConfigValue('OutputCompressionLevel');
 
@@ -3001,7 +2997,7 @@
 		$lang = $this->recallObject('lang.current');
 		/* @var $lang LanguagesItem */
 
-		header('Content-type: text/xml; charset=' . $lang->GetDBField('Charset'));
+		$this->setContentType('text/xml');
 
 		return $xml_version ? '<?xml version="' . $xml_version . '" encoding="' . $lang->GetDBField('Charset') . '"?>' : '';
 	}
@@ -3129,4 +3125,37 @@
 
 		return MaintenanceMode::NONE;
 	}
+
+	/**
+	 * Sets content type of the page
+	 *
+	 * @param string $content_type
+	 * @param bool $include_charset
+	 * @return void
+	 * @access public
+	 */
+	public function setContentType($content_type = 'text/html', $include_charset = null)
+	{
+		static $aleady_set = false;
+
+		if ( $aleady_set ) {
+			return;
+		}
+
+		$header = 'Content-type: ' . $content_type;
+
+		if ( !isset($include_charset) ) {
+			$include_charset = $content_type = 'text/html' || $content_type = 'text/xml';
+		}
+
+		if ( $include_charset ) {
+			$language = $this->recallObject('lang.current');
+			/* @var $language LanguagesItem */
+
+			$header .= '; charset=' . $language->GetDBField('Charset');
+		}
+
+		$aleady_set = true;
+		header($header);
+	}
 }
\ No newline at end of file
Index: kernel/db/db_event_handler.php
===================================================================
--- kernel/db/db_event_handler.php	(revision 15165)
+++ kernel/db/db_event_handler.php	(working copy)
@@ -3227,7 +3227,7 @@
 			}
 
 			header('Content-Length: ' . filesize($path));
-			header('Content-Type: ' . kUtil::mimeContentType($path));
+			$this->Application->setContentType(kUtil::mimeContentType($path), false);
 			header('Content-Disposition: inline; filename="' . $file . '"');
 
 			readfile($path);
@@ -3359,8 +3359,7 @@
 		{
 			$event->status = kEvent::erSTOP;
 
-			/*$lang = $this->Application->recallObject('lang.current');
-			header('Content-type: text/xml; charset=' . $lang->GetDBField('Charset'));*/
+//			$this->Application->setContentType('text/xml');
 
 			$picker_helper = $this->Application->recallObject('ColumnPickerHelper');
 			/* @var $picker_helper kColumnPickerHelper */
Index: kernel/processors/main_processor.php
===================================================================
--- kernel/processors/main_processor.php	(revision 15165)
+++ kernel/processors/main_processor.php	(working copy)
@@ -1064,11 +1064,6 @@
 			return $this->Application->XMLHeader(getArrayValue($params, 'xml_version'));
 		}
 
-		$lang = $this->Application->recallObject('lang.current');
-		/* @var $lang LanguagesItem */
-
-		header('Content-type: text/html; charset=' . $lang->GetDBField('Charset'));
-
 		return '';
 	}
 
Index: units/fck/fck_eh.php
===================================================================
--- units/fck/fck_eh.php	(revision 15165)
+++ units/fck/fck_eh.php	(working copy)
@@ -65,7 +65,8 @@
 			// HTTP/1.0
 			header('Pragma: no-cache') ;
 			// Set the response format.
-			header( 'Content-Type: text/xml; charset=utf-8' ) ;
+
+			$this->Application->setContentType('text/xml');
 			// Create the XML document header.
 		}
 
Index: units/helpers/csv_helper.php
===================================================================
--- units/helpers/csv_helper.php	(revision 15165)
+++ units/helpers/csv_helper.php	(working copy)
@@ -174,7 +174,7 @@
 			$export_data = unserialize($this->Application->RecallVar('export_data'));
 			$filename = preg_replace('/(.*)\.csv$/', '\1', basename($export_data['file_name'])) . '.csv';
 
-			header('Content-type: text/csv');
+			$this->Application->setContentType('text/csv');
 			header('Content-Disposition: attachment; filename="' . $filename . '"');
 			readfile($export_data['file_name']);
 			die();
Index: units/helpers/file_helper.php
===================================================================
--- units/helpers/file_helper.php	(revision 15165)
+++ units/helpers/file_helper.php	(working copy)
@@ -255,7 +255,7 @@
 		 */
 		public function DownloadFile($filename)
 		{
-			header('Content-type: ' . kUtil::mimeContentType($filename));
+			$this->Application->setContentType(kUtil::mimeContentType($filename), false);
 			header('Content-Disposition: attachment; filename="' . basename($filename) . '"');
 			header('Content-Length: ' . filesize($filename));
 			readfile($filename);