I am making a game with Javascript which requires users to flip cards. I am having a problem with the `style.background` property. It is working fine in Chrome but not in IE.

Here is the piece of code in question:

```
function flipBack() { 
    var tile_1 = document.getElementById(memory_tile_ids[0]);
    var tile_2 = document.getElementById(memory_tile_ids[1]);
    tile_1.style.background = "url('Images/tile_bg.png') no-repeat";
    tile_1.innerHTML = "";
    tile_2.style.background = "url('Images/tile_bg.png') no-repeat";
    tile_2.innerHTML = "";
    memory_values = [];
    memory_tile_ids = [];
}

```

Can anyone help me?  

Thank you in advance.