Change Text Color on mouseover

I'm hoping to accomplish this using pure CSS and Javascript. I'm ok with PHP as well. I'm avoiding jquery because I'm trying to learn javascript a bit more and I've found that in some word-press sites jquery doesn't always work the way I need it to. As far as I can tell I haven't made any programmatic errors, but I must be missing something because it doesn't seem to be working correctly. First I'll give a link where the code can be found. http://jsfiddle.net/FFCFy/13/

Next I'll give the actual code.

Javascript:

setInterval(function() {
    var x = document.getElementById("div1");
    var y = document.getElementById("div2");

    function stext() {
        x.style.color = 'red';
        y.style.color = 'black';
    }

    function htext() {
        x.style.color = 'black';
        y.style.color = 'red';
    }
}, 250);

html:

<html>
<body>
    <span id="div1" style="color:black;" onmouseover="stext"   onmouseout="htext">TEXT1</span><p />
    <hr color="black" />
<span id="div2" style="color:red;"onmouseover="htext" onmouseout="stext">Text2</span>

</body>
</html>

Eventually I'll be modifying this to hide and show different text, but I'll get to that once I have this figured out.

Solution

You don't need the setInterval.

function stext() {
    var x = document.getElementById("div1");
    var y = document.getElementById("div2");
    x.style.color = 'red';
    y.style.color = 'black';
}

Updated Working JSFiddle