Combine images

script.js

jQuery(document).ready(function() {
	// Add the event listainer to each field
	addEventListeners('css selector of fields');
});

function changeSrc(img, url) {
	// Set the src attribute of the image
	image.attr('src', url);
}

function addEventListeners(fieldSelector) {
	// Get all of the fields on the page
	var fields = jQuery(fieldSelector);

	// Add the relevant event listainer
	fields.each(function(index) {
		$(this).change(function() {
			changeSrc($(this), getURLForImg($(this).val()));
		});
	});
}

function getURLForImg(fieldValue) {
	// Get the url corresponding to the image
}