jquery.corner.js problem in IE and Opera

jquery.corner.js problem in IE and Opera

i am getting a strange error message from jquery.corner.js [downloaded from http://jquery.malsup.com/corner/ version 2.09 (11-MAR-2010)] in IE and Opera.
further script calls are ignored, so the page looks horrible.

Opera Error Log:
Unhandled exception: [Object InternalException]
name: Error
message: WRONG_ARGUMENTS_ERR
stacktrace:   Line 808 of linked script http://mydomain.com/javascripts/jquery.js
     var computedStyle = defaultView.getComputedStyle( elem, null );
  Line 778 of linked script http://mydomain.com/javascripts/jquery.js
     return jQuery.curCSS( elem, name, force );
  Line 45 of linked script http://mydomain.com/javascripts/jquery.corner.js: In function gpc
            var v = $.css(node,'backgroundColor');
  Line 143 of linked script http://mydomain.com/javascripts/jquery.corner.js
            strip.style.borderColor = cc || gpc(this.parentNode);
  ...  Line 691 of linked script http://mydomain.com/javascripts/jquery.js
     for ( var value = object[0];
  Line 155 of linked script http://mydomain.com/javascripts/jquery.js
     return jQuery.each( this, callback, args );
        return this.each(function(index){
                    $(s,c).corner(options);
  ...  Line 3032 of linked script http://mydomain.com/javascripts/jquery.js
     this.call( document, jQuery );
  ...  Line 691 of linked script http://mydomain.com/javascripts/jquery.js
     for ( var value = object[0];
  Line 3031 of linked script http://mydomain.com/javascripts/jquery.js
     jQuery.each( jQuery.readyList, function(){
  Line 3056 of linked script http://mydomain.com/javascripts/jquery.js
     jQuery.ready();
  ...


IE gets the same error but only shows the following info:

line: 155
char: 17
code: 0
errorMessage: Unexpected call to method or property access

any suggestions or hints?
thx in advance