Edit in JSFiddle

this.item ="window item";

var objLuckshim = {
	item : 'luckshim',
  callme : function(){
  	document.writeln(this.item);
  }
}

var objAspdotnet = {
	item : 'aspdotnet',
  subitem : 'subcallme',
  callme : objLuckshim.callme
}

obj2.callme(); //aspdotnet

function callItem(){
	document.writeln(this.item);
}

var bindSample = callItem.bind(objAspdotnet);
bindSample(); //aspdotnet

callItem.apply(objAspdotnet); //aspdotnet
callItem.call(objLuckshim); //luckshim
callItem(); //window item