How to close popup portlet when parent window is closed

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1

I have the below js. popUpWindow function is called from a command button click event. Not sure, why child window is not closing.

var loadedWindows = new Array();


//Define window width and height
var screenWidth;
var screenHeight;
var x = screen.width;
var y = screen.height;
var num1 = new Number(x);
var w = num1 - 125;
var num2 = new Number(y);
var h= num2 - 75;
var left = num1;


/**
 * Define method to open window keep track of opened child windows.
 */
popUpWindow = function(wndUrl, wndName, wndWidth, wndHeight, sourceID){
	
	var windObj = null;
	try
	{	
		//set default width 
		if(typeof wndWidth == 'undefined') wndWidth=screenWidth;
		//set default height
		if(typeof wndHeight == 'undefined') wndHeight=screenHeight;
		
		
		if(document.documentElement.clientWidth < 1090){
			windObj = window.open(wndUrl, 
					//misc options to open a window, again mostly optional 
					wndName, "left="+left+",top=0,location=0,status=1,scrollbars=yes, resizable=yes,width="+(h-110)+",height="+(h+65));
			
			
		} else {
			windObj = window.open(wndUrl, 
					//misc options to open a window, again mostly optional 
					wndName, "left="+left+",top=0,location=0,status=1,scrollbars=yes, resizable=yes,width="+y+",height="+x);
		}

		
		
			loadedWindows[loadedWindows.length] = windObj;
			
	
		
		return windObj;
	}
	catch(ex){
		alert('WindowController.popUpWindow: ' + 'Exception occured, message: ' + ex.message);
	}
	return windObj;
};


/**
 * Method to register close event - to close window on close of parent window 
 */
function WireEvent(elem,target,func){
	if (elem.addEventListener)
		elem.addEventListener(target, func, false); //FF
	else if (elem.attachEvent){
		
		elem.attachEvent(target, func); //IE
	}
}

/**
 * method to close all windows 
 */
closeAllWindows = function(){
	
	for(var x = 0; x < loadedWindows.length; x++){
		
		try{
			
			loadedWindows[x].close();
			
			
		}
		catch(err) {
			alert('WindowController.closeAllWindows: ' +'Exception occured, message: ' + err.message);
		}
	}
};

WireEvent(window,'onunload',this.closeAllWindows);