add:  this.document = null; 
context: 	hide: function() {						// if the mask is visible and we can hide it		if (typeof(Wicket.Window.Mask.element) != "undefined" && typeof(this.dontHide) == "undefined") {				// remove element from document				document.body.removeChild(this.element);			this.element = null;												// restore old handlers			window.onscroll = this.old_onscroll;			window.onresize = this.old_onresize;									Wicket.Window.Mask.element = null;					}					// show old select boxes (ie only)		this.showSelectBoxes();				// restore tab order		this.restoreTabs();				// revert onfocus handlers		this.enableFocus();	},
meta: 1204	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1204/de43bc2cae6b324eb459bfca9c4a4d244f285714/modal.js/clean/jdk-1.4/wicket-extensions/src/main/java/wicket/extensions/ajax/markup/html/modal/res/modal.js