Cart – Redirect Add to Cart Button to Cart Page

IF we click on "Buy now " button in view page

its redirecting to cart page. we are using following code :

<button class="button buy-now" onclick=”location.href =’{{config path=”web/unsecure/base_url”}}/checkout/cart/add?product=1&qty=1′”>
<span><span><i class="fa fa-shopping-cart"></i>Buy Now</span></span></button>

we are using following code for "Add to cart" button, what we need is if we click on "add to cart" button,

than it should redirect to cart page.

<button type="button" title="<?php echo $buttonTitle ?>" id="product-addtocart-button" class="button btn-cart" 
onclick="productAddToCartForm.submit(this)"><span><span><?php echo $buttonTitle ?></span></span></button>

edit

JS code :

 productAddToCartForm.submit = function(button, url) {
            if (('undefined' != typeof productAddToCartFormOld) && productAddToCartFormOld) {
                if (Catalog.Map.active) {
                    Catalog.Map.hideHelp();
                }
                if (productAddToCartForm.qty && $('qty')) {
                    $('qty').value = productAddToCartForm.qty;
                }
                parentResult = productAddToCartFormOld.submit();
                return false;
            }
            if(window.opener) {
                var parentButton = button;
                new Ajax.Request(this.form.action, {
                    parameters: {isAjax: 1, method: 'GET'},
                    onSuccess: function(transport) {
                        window.opener.focus();
                        if (parentButton && parentButton.href) {
                            setPLocation(parentButton.href, true);
                            Catalog.Map.hideHelp();
                        }
                    }
                });
                return;
            }
            if (this.validator.validate()) {
                var form = this.form;
                var oldUrl = form.action;

                if (url) {
                   form.action = url;
                }
                if (!form.getAttribute('action')) {
                   form.action = productAddToCartForm.action;
                }
                try {
                    this.form.submit();
                } catch (e) {
                    this.form.action = oldUrl;
                    throw e;
                }
                this.form.action = oldUrl;

                if (button && button != 'undefined') {
                    button.disabled = true;
                }
            }
        };