Как обратиться к массиву классов?
Вот приходит объект конфигурации

config = {
	col:3,
	els:[
		{img:'img/IMG_5613.jpg',
		name:'',
		url:[{name:'',link:''},{name:'',link:''},{name:'',link:''}]
		},
		{img:'img/IMG_5613.jpg',
		name:'',
		url:[{name:'',link:''},{name:'',link:''},{name:'',link:''}]
		},
		{img:'img/IMG_5613.jpg',
		name:'',
		url:[{name:'',link:''},{name:'',link:''},{name:'',link:''}]
		},
		{img:'img/IMG_5613.jpg',
		name:'',
		url:[{name:'',link:''},{name:'',link:''},{name:'',link:''}]
		},
		{img:'img/IMG_5613.jpg',
		name:'',
		url:[{name:'',link:''},{name:'',link:''},{name:'',link:''}]
		},
		{img:'img/IMG_5613.jpg',
		name:'',
		url:[{name:'',link:''},{name:'',link:''},{name:'',link:''}]
		},
	],
	css:{}
	
}

нужно обработать config.els

for(var i=1;i<=config.els.length;i++){
		var img = config.els[i].img;
		t+='<li><div><img src="'+img+'" /></div></li>';
	}

Мене говорит is undefined.
Если пишу var img = config.el[0].img; я получаю url картинки.