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function replace_unsplash_urls(width, height) {
    var url = '';
    var prev_url = '';

    var links = document.querySelectorAll('#gridMulti a');
    for(var i = 0; i < links.length; i++) {
        var item = links.item(i);
        url = links.item(i).style.getPropertyValue('background-image');
        console.log(i, url)
        if (url) {
            url = url.slice(5, -2);
            url = url.replace(/(w=).*?(&)/,'$1' + width + '$2');
            url = url.replace(/(h=).*?(&)/,'$1' + height + '$2');
            prev_url = url;
            console.log('save url', url)
        }
        if (i % 2 != 0) {
            //console.log(item, prev_url)
            item.href = prev_url;
            console.log('asign url', item.href,  prev_url);
            var p = document.createElement('p')
            var a = document.createElement('a')
            a.setAttribute('href', prev_url);
            a.setAttribute('target', '_blank');
            a.innerHTML = width + 'x' + height;;
            p.appendChild(a);
            item.parentElement.parentElement.parentElement.prepend(p);
        }
    }
}
replace_unsplash_urls(1500, 600);