Index: wp-includes/js/thickbox/thickbox.css
===================================================================
--- wp-includes/js/thickbox/thickbox.css	(Revision 18817)
+++ wp-includes/js/thickbox/thickbox.css	(Arbeitskopie)
@@ -49,7 +49,7 @@
 	background: #ffffff;
 	z-index: 102;
 	color:#000000;
-	visibility: hidden;
+	display: block;
 	text-align:left;
 	top:50%;
 	left:50%;
Index: wp-includes/js/thickbox/thickbox.js
===================================================================
--- wp-includes/js/thickbox/thickbox.js	(Revision 18817)
+++ wp-includes/js/thickbox/thickbox.js	(Arbeitskopie)
@@ -182,7 +182,7 @@
 			tb_position();
 			jQuery("#TB_load").remove();
 			jQuery("#TB_ImageOff").click(tb_remove);
-			jQuery("#TB_window").css({display:"block"}); //for safari using css instead of show
+			jQuery("#TB_window").show();
 			};
 
 			imgPreloader.src = url;
@@ -230,19 +230,19 @@
 					});
 					tb_position();
 					jQuery("#TB_load").remove();
-					jQuery("#TB_window").css({display:"block"});
+					jQuery("#TB_window").show();
 				}else if(url.indexOf('TB_iframe') != -1){
 					tb_position();
 					if(jQuery.browser.safari){//safari needs help because it will not fire iframe onload
 						jQuery("#TB_load").remove();
-						jQuery("#TB_window").css({display:"block"});
+						jQuery("#TB_window").show();
 					}
 				}else{
 					jQuery("#TB_ajaxContent").load(url += "&random=" + (new Date().getTime()),function(){//to do a post change this load method
 						tb_position();
 						jQuery("#TB_load").remove();
 						tb_init("#TB_ajaxContent a.thickbox");
-						jQuery("#TB_window").css({display:"block"});
+						jQuery("#TB_window").show();
 					});
 				}
 
@@ -269,7 +269,7 @@
 //helper functions below
 function tb_showIframe(){
 	jQuery("#TB_load").remove();
-	jQuery("#TB_window").css({'visibility':'visible'});
+	jQuery("#TB_window").show();
 }
 
 function tb_remove() {