JavaScript to get 500px photo URL (remember to always give credit to photographer)

gistfile1.js

//REMEMBER TO ALWAYS GIVE CREDIT TO THE PHOTOGRAPHER
//NOT INTENDED TO STEAL 500PX PHOTOS
//THEY ARE NOT PUBLIC PROPERTY AND SHOULD NOT BE USED FOR COMERCIAL PURPOSES

function getPhoto () {
	// usage: 
	// 	function returns object with URL, author and title tags
	// 	simply use getPhoto().URL, or .author or .title
	// 	or store result in variable, var someVar = getPhoto()
	// 	and access values in the same way
	var els = document.getElementsByTagName("img");
	var photoDOM ="";
	for(var i=0; i<els.length; i++){
		if (els[i].className == "the_photo"){
			photoDOM = els[i];
			
			var photo = {
				URL : photoDOM.src,
				author: photoDOM.getAttribute("data-protect"),
				title: photoDOM.getAttribute("alt"),
			}
			window.open(photo.URL);
			return photo;
		}
	}
	console.warn("Could not find the_photo");
	return -1;
}