Index: src/event.js
===================================================================
--- src/event.js	(revision 4241)
+++ src/event.js	(working copy)
@@ -489,27 +489,58 @@
 	if ( readyBound ) return;
 	readyBound = true;
 
-	// Mozilla, Opera and webkit nightlies currently support this event
-	if ( document.addEventListener )
+	// Mozilla, Opera (see further below for it) and webkit nightlies currently support this event
+	if ( document.addEventListener && !jQuery.browser.opera)
 		// Use the handy event callback
 		document.addEventListener( "DOMContentLoaded", jQuery.ready, false );
 	
 	// If Safari or IE is used
 	// Continually check to see if the document is ready
-	if (jQuery.browser.msie || jQuery.browser.safari ) (function(){
+	if ( jQuery.browser.msie ) (function(){
+		if (jQuery.isReady) return;
 		try {
 			// If IE is used, use the trick by Diego Perini
 			// http://javascript.nwbox.com/IEContentLoaded/
-			if ( jQuery.browser.msie || document.readyState != "loaded" && document.readyState != "complete" )
-				document.documentElement.doScroll("left");
+			document.documentElement.doScroll("left");
 		} catch( error ) {
-			return setTimeout( arguments.callee, 0 );
+			setTimeout( arguments.callee, 0 );
+			return;
 		}
-
 		// and execute any waiting functions
 		jQuery.ready();
 	})();
 
+	if ( jQuery.browser.opera )
+		document.addEventListener( "DOMContentLoaded", function () {
+			if (jQuery.isReady) return;
+			for (var i = 0; i < document.styleSheets.length; i++)
+				if (document.styleSheets[i].disabled) {
+					setTimeout( arguments.callee, 0 );
+					return;
+				}
+			// and execute any waiting functions
+			jQuery.ready();
+		}, false);
+
+	if ( jQuery.browser.safari ) {
+		var numStyles;
+		(function(){
+			if (jQuery.isReady) return;
+			if ( document.readyState != "loaded" && document.readyState != "complete" ) {
+				setTimeout( arguments.callee, 0 );
+				return;
+			}
+			if ( numStyles === undefined )
+				numStyles = jQuery("style, link[rel=stylesheet]").length;
+			if ( document.styleSheets.length != numStyles ) {
+				setTimeout( arguments.callee, 0 );
+				return;
+			}
+			// and execute any waiting functions
+			jQuery.ready();
+		})();
+	}
+
 	// A fallback to window.onload, that will always work
 	jQuery.event.add( window, "load", jQuery.ready );
 }