progress bar using JavaScript

Here’s a littile progress bar I’ve created using JavaScript. I’ve use JavaScript setInterval() to increase the progress bar & clearInterval() to stop progress bar.

//Create dom
var bar = document.createElement("div");
progressBar = document.createElement("div");
with(bar.style){
    width = "200px";
    height = "10px";
    position = "absolute";
    border = "1px solid #949DAD";
};

with(progressBar.style){
    width = "0px";
    height = "100%";
    background = "#D4E4FF none repeat scroll 0 0";
};

bar.appendChild(progressBar);
document.body.appendChild(bar);

//start setInterval
var x = window.setInterval(
	function(){
                progressBar.style.width = parseInt(progressBar.style.width) + 5 + "px";
            //stop interval when progress bar width = 200
            if(parseInt(progressBar.style.width) == 200) clearInterval(x);
	},
	40
);