function mouseOverBlock(type) {
            var type_image = document.getElementById("block_" + type + "_image");
            type_image.style.backgroundImage = "url('images/blocks/" + type + "_image2.png')";
}
function mouseOutBlock(type) {
            var type_image = document.getElementById("block_" + type + "_image");
            type_image.style.backgroundImage = "url('images/blocks/" + type + "_image1.png')";
}
function redirect(page) {
            window.location = page + '.php';
}