Colorbox - open all links to images in a modal [in jQuery]

colorbox-images.js

$('a').on('click touchstart', function(){
	var img_href 	= $(this).attr('href');
	var img_ext 	= img_href.substr(img_href.lastIndexOf('.')+1);
	var ext_array 	= new Array('gif','jpg','png','jpeg');
	if($.inArray(img_ext,ext_array)>-1) {
		$(this).colorbox();
	}
});