Check For Dead Links - HTTP Request

I've come back to working on something I built a while ago. Just a small function that I started that displays links by searching through a text area and grabbing all a hrefs. I want to try and build on it to check for dead links. This is the report code:
Code:
function report(){
document.getElementById("htmlDiv").innerHTML = document.getElementById("htmlArea").value;
a = document.getElementById("htmlDiv").getElementsByTagName("a");
for(i=0; i < a.length; i++){
//window.open(a[i].href)//the ( and ) characters signify that window.open is a function;
if(i == 0){
document.getElementById("report").innerHTML = "<li><a href="" + a[i].href + "" />" + a[i].href + "</a></li>";
document.getElementById("report").style.display = "block";
} else {
document.getElementById("report").innerHTML += "<li><a href="" + a[i].href + "" />" + a[i].href + "</a></li>";
}}
document.getElementById("reportNumber").innerHTML = "Total: " + i;
}

I was thinking maybe I could encorporate the following into this maybe?
Code:
function UrlExists(url) {
var http = new XMLHttpRequest();
http.open('HEAD', url, false);
http.send();
return http.status!=404;
}
The above makes sense to me as I think it is saying as long as its not 404 its ok. I want to incorporate something like that so my report displays links and maybe strikes them through if they return 404 or are dead.