function onlyDirectChildren(node, collection){
	var theChildren = [];
	for(var i = 0; i < collection.length; i++){
		if(collection[i].parentNode === node)theChildren.push(collection[i]);
	}
	return theChildren;
}

if(!('rows' in HTMLTableElement.prototype))Object.defineProperty(
	HTMLTableElement.prototype,
	'rows',
	{

		get: function(){
			return onlyDirectChildren(this, this.getElementsByTagName('tr'));
		}
	}

);

if(!('tBodies' in HTMLTableElement.prototype))Object.defineProperty(
	HTMLTableElement.prototype,
	'tBodies',
	{

		get: function(){
			return onlyDirectChildren(this, this.getElementsByTagName('tbody'));
		}
	}

);

if(!('rows' in HTMLTableSectionElement.prototype))Object.defineProperty(
	HTMLTableSectionElement.prototype,
	'rows',
	{

		get: function(){
			return onlyDirectChildren(this, this.getElementsByTagName('tr'));
		}
	}

);

if(!('cells' in HTMLTableRowElement.prototype))Object.defineProperty(
	HTMLTableRowElement.prototype,
	'cells',
	{

		get: function(){
			return onlyDirectChildren(this, this.querySelectorAll('th,td'));
		}
	}

);