diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index eece0b1005f..bfbf0f8414e 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -1833,7 +1833,7 @@ function dolButtonToOpenUrlInDialogPopup($name, $label, $buttonstring, $url, $di
 
 	//print '<input type="submit" class="button bordertransp"'.$disabled.' value="'.dol_escape_htmltag($langs->trans("MediaFiles")).'" name="file_manager">';
 	$out .= '<!-- a link for button to open url into a dialog popup with backtopagejsfields = '.$backtopagejsfields.' -->';
-	$out .= '<a '.($accesskey ? ' accesskey="'.$accesskey.'"' : '').' class="cursorpointer button_'.$name.($morecss ? ' '.$morecss : '').'"'.$disabled.' title="'.dol_escape_htmltag($label).'"';
+	$out .= '<a '.($accesskey ? ' accesskey="'.$accesskey.'"' : '').' class="cursorpointer reposition button_'.$name.($morecss ? ' '.$morecss : '').'"'.$disabled.' title="'.dol_escape_htmltag($label).'"';
 	if (empty($conf->use_javascript_ajax)) {
 		$out .= ' href="'.DOL_URL_ROOT.$url.'" target="_blank"';
 	} elseif ($jsonopen) {
@@ -1879,6 +1879,7 @@ function dolButtonToOpenUrlInDialogPopup($name, $label, $buttonstring, $url, $di
 							});
 
 							$tmpdialog.dialog(\'open\');
+							return false;
 						});
 					});
 				</script>';