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// Sexy JavaScript
// runs assertNotNull(iframeElement) in IE, otherwise assertNull(iframeElement)
// taken from test code for http://yura.thinkweb2.com/scripting/contextMenu/

testShimExists: function() { with(this) {
  this[Prototype.Browser.IE ? 'assertNotNull' : 'assertNull'](iframeElement);
}},