使用javascript动态启用和禁用css文件？

I am very new to javascript. I am creating a multilingual website. It contains rtl and ltr languages. I have two css for those to languages. When user change his language I want to load respective css file. Is it possible in this way ? If not suggest any alternative way.

Is posible enable and disable css stylesheet with javascript. A example: http://plnkr.co/0exLXB

function del_style() {
    document.getElementById("styles").disabled=true;
}

function add_style() {
    document.getElementById("styles").disabled=false;
}

I think you could adapt the code for your site