diff --git a/product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/erp5.css.xml b/product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/erp5.css.xml
index da6ce61b83c907540c1136b43a3e0bc1b47d77f1..a05e52b31b66be86e8f1e794c625d46fe9d6f398 100644
--- a/product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/erp5.css.xml
+++ b/product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/erp5.css.xml
@@ -516,7 +516,7 @@ div.index_html table {\n
 }\n
 \n
 /* The fields set for generated hidden fields */\n
-#hidden_fieldset { display: None }\n
+#hidden_fieldset { visibility: hidden }\n
 \n
 /* Main bar */\n
 \n
diff --git a/product/ERP5/bootstrap/erp5_xhtml_style/bt/change_log b/product/ERP5/bootstrap/erp5_xhtml_style/bt/change_log
index c0ba0c7ff06f52be0370d3b3777b550e59ccd7b3..80a5872cfc0f36e27d9037587950e80b6993ded0 100644
--- a/product/ERP5/bootstrap/erp5_xhtml_style/bt/change_log
+++ b/product/ERP5/bootstrap/erp5_xhtml_style/bt/change_log
@@ -1,3 +1,6 @@
+2010-1-31 Yusei
+* Update erp5.css and replace "display:none" with "visibility:hidden" to fix webkit based browser problem.
+
 2009-12-11 Kazuhiko
 * update FCKeditor to 2.6.5.
 
diff --git a/product/ERP5/bootstrap/erp5_xhtml_style/bt/revision b/product/ERP5/bootstrap/erp5_xhtml_style/bt/revision
index 0f2ed730d557d9ab8db8085e804a457be904de28..f8f450742a63c8b33daf54d0211842f71bac56da 100644
--- a/product/ERP5/bootstrap/erp5_xhtml_style/bt/revision
+++ b/product/ERP5/bootstrap/erp5_xhtml_style/bt/revision
@@ -1 +1 @@
-877
\ No newline at end of file
+878
\ No newline at end of file