Need as3 help

some one explain what is the meaning of this code this code is for xml menu
i have bold and underline the code that i don’t understand
there are three lines which i have bold and underlined

**Final Code **

[COLOR=#808080]//Imports needed for animation[/COLOR]
[COLOR=#0066CC]import[/COLOR] fl.[COLOR=#006600]transitions[/COLOR].[COLOR=#006600]Tween[/COLOR];
[COLOR=#0066CC]import[/COLOR] fl.[COLOR=#006600]transitions[/COLOR].[COLOR=#006600]easing[/COLOR].[COLOR=#66CC66]*[/COLOR];

[COLOR=#808080]//XML file path[/COLOR]
[COLOR=#808080]//You can use the following path as well if you want…[/COLOR]
[COLOR=#000000]var[/COLOR] xmlPath:[COLOR=#0066CC]String[/COLOR] = [COLOR=#FF0000]“http://flashmymind.com/SWF/site.xml”[/COLOR];

[COLOR=#808080]//The XML data will be inserted into this variable[/COLOR]
[COLOR=#000000]var[/COLOR] settingsXML:[COLOR=#0066CC]XML[/COLOR];

[COLOR=#808080]//Array used for the tween so they won’t get garbage collected[/COLOR]
[COLOR=#000000]var[/COLOR] tweensArray:[COLOR=#0066CC]Array[/COLOR] = [COLOR=#000000]new[/COLOR] [COLOR=#0066CC]Array[/COLOR]COLOR=#66CC66[/COLOR];
[COLOR=#808080]//Used later when we animate the buttons[/COLOR]
[COLOR=#000000]var[/COLOR] buttonTween:Tween;

[COLOR=#808080]// Load the XML file[/COLOR]
[COLOR=#000000]var[/COLOR] loader = [COLOR=#000000]new[/COLOR] URLLoaderCOLOR=#66CC66[/COLOR];
loader.[COLOR=#0066CC]load[/COLOR] [COLOR=#66CC66]([/COLOR][COLOR=#000000]new[/COLOR] URLRequestCOLOR=#66CC66[/COLOR][COLOR=#66CC66])[/COLOR];
loader.[COLOR=#006600]addEventListener[/COLOR] [COLOR=#66CC66]([/COLOR]Event.[COLOR=#006600]COMPLETE[/COLOR], xmlLoaded[COLOR=#66CC66])[/COLOR];

[COLOR=#808080]//This function is called when the XML file is loaded[/COLOR]
[COLOR=#000000]function[/COLOR] xmlLoaded COLOR=#66CC66[/COLOR]:[COLOR=#0066CC]void[/COLOR] [COLOR=#66CC66]{[/COLOR]

[COLOR=#808080]*//Make sure we're not working with a null loader*[/COLOR]
[COLOR=#B1B100]if[/COLOR] [COLOR=#66CC66]([/COLOR][COLOR=#66CC66]([/COLOR][COLOR=#0066CC]e[/COLOR].[COLOR=#0066CC]target[/COLOR] as URLLoader[COLOR=#66CC66])[/COLOR] [COLOR=#66CC66]![/COLOR]= [COLOR=#000000]**null**[/COLOR] [COLOR=#66CC66])[/COLOR] [COLOR=#66CC66]{[/COLOR]
	[COLOR=#808080]*//Insert the loaded data to our XML variable*[/COLOR]
	settingsXML = [COLOR=#000000]**new**[/COLOR] [COLOR=#0066CC]XML[/COLOR][COLOR=#66CC66]([/COLOR]loader.[COLOR=#0066CC]data[/COLOR][COLOR=#66CC66])[/COLOR];
	settingsXML.[COLOR=#006600]ignoreWhitespace[/COLOR] = [COLOR=#000000]**true**[/COLOR];
	[COLOR=#808080]*//Call the function that creates the whole menu*[/COLOR]
	createMenu [COLOR=#66CC66]([/COLOR][COLOR=#66CC66])[/COLOR];
[COLOR=#66CC66]}[/COLOR]

[COLOR=#66CC66]}[/COLOR]

[COLOR=#000000]function[/COLOR] createMenu COLOR=#66CC66[/COLOR]:[COLOR=#0066CC]void[/COLOR] [COLOR=#66CC66]{[/COLOR]
[COLOR=#808080]//This will be used to represent a menu item[/COLOR]
[COLOR=#000000]var[/COLOR] menuItem:MenuItem;
[COLOR=#808080]//Counter[/COLOR]
[COLOR=#000000]var[/COLOR] i:uint = [COLOR=#CC66CC]0[/COLOR];

[COLOR=#808080]*//Loop through the links found in the XML file*[/COLOR]
[COLOR=#B1B100]for[/COLOR] each [COLOR=#66CC66]([/COLOR][COLOR=#000000]**var**[/COLOR] link:[COLOR=#0066CC]XML[/COLOR] [COLOR=#B1B100]in[/COLOR] settingsXML.[COLOR=#006600]links[/COLOR].[COLOR=#006600]link[/COLOR][COLOR=#66CC66])[/COLOR] [COLOR=#66CC66]{[/COLOR]

	[U]**menuItem = [COLOR=#000000]**new**[/COLOR] MenuItem[COLOR=#66CC66]([/COLOR][COLOR=#66CC66])[/COLOR];**[/U]

	[COLOR=#808080]*//Insert the menu text ([email protected] reads the link's "name" attribute)*[/COLOR]
	menuItem.[COLOR=#006600]menuLabel[/COLOR].[COLOR=#0066CC]text[/COLOR] = link.[COLOR=#66CC66]@[/COLOR][COLOR=#0066CC]name[/COLOR];

	[COLOR=#808080]*//If the text is longer than the textfield, autosize so that the text is *[/COLOR]
	[COLOR=#808080]*//treated as left-justified text*[/COLOR]
	menuItem.[COLOR=#006600]menuLabel[/COLOR].[COLOR=#0066CC]autoSize[/COLOR] = TextFieldAutoSize.[COLOR=#0066CC]LEFT[/COLOR];

	[COLOR=#808080]*//Insert the menu button to stage*[/COLOR]
	menuItem.[COLOR=#006600]x[/COLOR] = [COLOR=#CC66CC]20[/COLOR];
	[U]**menuItem.[COLOR=#006600]y[/COLOR] = [COLOR=#CC66CC]30[/COLOR] + i[COLOR=#66CC66]*[/COLOR][COLOR=#CC66CC]40[/COLOR];**[/U]

	[COLOR=#808080]*//Make the button look like a button (hand cursor)*[/COLOR]
	menuItem.[COLOR=#006600]buttonMode[/COLOR] = [COLOR=#000000]**true**[/COLOR];
	menuItem.[COLOR=#006600]mouseChildren[/COLOR] = [COLOR=#000000]**false**[/COLOR];

	[COLOR=#808080]*//Add event handlers (used for animating the buttons)*[/COLOR]
	menuItem.[COLOR=#006600]addEventListener[/COLOR] [COLOR=#66CC66]([/COLOR]MouseEvent.[COLOR=#006600]MOUSE_OVER[/COLOR], mouseOverHandler[COLOR=#66CC66])[/COLOR];
	menuItem.[COLOR=#006600]addEventListener[/COLOR] [COLOR=#66CC66]([/COLOR]MouseEvent.[COLOR=#006600]MOUSE_OUT[/COLOR], mouseOutHandler[COLOR=#66CC66])[/COLOR];

	addChild [COLOR=#66CC66]([/COLOR]menuItem[COLOR=#66CC66])[/COLOR];

	[COLOR=#808080]*//Increment the menu button counter, so we know how many buttons there are*[/COLOR]
	i++;
[COLOR=#66CC66]}[/COLOR]

[COLOR=#66CC66]}[/COLOR]

[COLOR=#808080]//Function is called when the mouse is over a menu button[/COLOR]
[COLOR=#000000]function[/COLOR] mouseOverHandler COLOR=#66CC66[/COLOR]:[COLOR=#0066CC]void[/COLOR] [COLOR=#66CC66]{[/COLOR]

[COLOR=#808080]*//Double the width*[/COLOR]
buttonTween = [COLOR=#000000]**new**[/COLOR] Tween[COLOR=#66CC66]([/COLOR][COLOR=#0066CC]e[/COLOR].[COLOR=#0066CC]target[/COLOR], [COLOR=#FF0000]"scaleX"[/COLOR], Elastic.[COLOR=#006600]easeOut[/COLOR], [COLOR=#CC66CC]1[/COLOR], [COLOR=#CC66CC]2[/COLOR], [COLOR=#CC66CC]1[/COLOR], [COLOR=#000000]**true**[/COLOR][COLOR=#66CC66])[/COLOR];	

[COLOR=#66CC66]}[/COLOR]

[COLOR=#808080]//Function is called when the mouse moves out from the menu button[/COLOR]
[COLOR=#000000]function[/COLOR] mouseOutHandler COLOR=#66CC66[/COLOR]:[COLOR=#0066CC]void[/COLOR] [COLOR=#66CC66]{[/COLOR]

[COLOR=#808080]*//Tween back original scale*[/COLOR]
 buttonTween = [COLOR=#000000]**new**[/COLOR] Tween[COLOR=#66CC66]([/COLOR][COLOR=#0066CC]e[/COLOR].[COLOR=#0066CC]target[/COLOR], [COLOR=#FF0000]"scaleX"[/COLOR], Elastic.[COLOR=#006600]easeOut[/COLOR], [COLOR=#0066CC]e[/COLOR].[COLOR=#0066CC]target[/COLOR].[COLOR=#006600]scaleX[/COLOR], [COLOR=#CC66CC]1[/COLOR], [COLOR=#CC66CC]1[/COLOR], [COLOR=#000000]**true**[/COLOR][COLOR=#66CC66])[/COLOR];

[COLOR=#66CC66]}[/COLOR]

This is the tutorial link
http://tutorials.flashmymind.com/2009/02/creating-a-menu-via-xml/