Repeat Background x and y not working

Hello All;
have the following image.

I need to tile this image inside of a div.

If I use the following code, it stretches the image, not repeating.

sym.$('Rectangle3').css({"background-image":"url(images/grass2.png)","background-repeat":" repeat-y repeat-x", "height":"200px", "Width":"200px"});

So.

My question is, HOW?

How can you repeat the image?

Thanks