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@@ -1,3 +1,5 @@
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+* Use different tactic to sniff for Opera in order to avoid false positives in IE. [Tobie Langel, jddalton]
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+
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 * Optimize Function#bind and Function#bindAsEventListener to avoid using Array#concat when only the context argument is given. [kangax]
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 * Ensure Selector.handlers.id finds the proper element even when it's not attached to the document. [jddalton]

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@@ -475,7 +475,7 @@ Element.Methods = {
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       element.style.position = 'relative';
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       // Opera returns the offset relative to the positioning context, when an
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       // element is position relative but top and left have not been defined
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-      if (window.opera) {
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+      if (Prototype.Browser.Opera) {
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         element.style.top = 0;
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         element.style.left = 0;
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       }  

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@@ -4,10 +4,12 @@ var Prototype = {
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   Version: '<%= PROTOTYPE_VERSION %>',
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   Browser: {
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-    IE:     !!(window.attachEvent && !window.opera),
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-    Opera:  !!window.opera,
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+    IE:     !!(window.attachEvent &&
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+      navigator.userAgent.indexOf('Opera') === -1),
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+    Opera:  navigator.userAgent.indexOf('Opera') > -1,
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     WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
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-    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
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+    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && 
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+      navigator.userAgent.indexOf('KHTML') === -1,
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     MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
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   },
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