Lazy load function - adapted from blazy

lazyload_custom.js

function loadImages(container){
		var $ctn = container,
				els  = $ctn.find('.tile-background'),
				options = {};

				options.src = 'data-src';
				options.errorClass = 'lazyload--error';
				options.successClass = 'lazyload--success';

		els.each(function(index){

			// adapted from https://github.com/dinbror/blazy/blob/master/blazy.js -- line 171 --

			var ele = $(this)[0];
			var $that = $(this);
			var dataSrc = ele.getAttribute(options.src); // fallback to default 'data-src'

	    if (dataSrc) {
	        // var dataSrcSplitted = dataSrc.split(options.separator);
	        // var src = dataSrcSplitted[isRetina && dataSrcSplitted.length > 1 ? 1 : 0];
	        var src = dataSrc;
	        var isImage = ele.nodeName.toLowerCase() === 'img';
	        // // cleanup markup, remove data source attributes
	        ele.removeAttribute(options.src);
	        if (isImage || ele.src === undefined) {
	          var img = new Image();
	          img.onerror = function() {
	          	// console.log("image event : error");
	              if (options.error) options.error(ele, "invalid");
	              $(this).addClass(options.errorClass);
	          };
	          img.onload = function() {
	          	// console.log("image event : onload");
	              // Is element an image or should we add the src as a background image?
	              isImage ? ele.src = src : ele.style.backgroundImage = 'url("' + src + '")';
	              $that.addClass(options.successClass);
	              //could remove
	              if (options.success) options.success(ele);
	          };
						img.src = src; //preload
	        } else {
						ele.src = src;
						$that.addClass(options.successClass);
					}
		    } else {
		        //if (options.error) options.error(ele, "missing");
		        //if (!$(this).hasClass(options.errorClass)) $(this).addClass(options.errorClass);
		    }

		});
	}