Call JavaScript Function for Every 5 Seconds or 10 / 30 Seconds

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Introduction: 
Here I will explain how to call a JavaScript function for every 5 seconds or run / execute JavaScript function at regular intervals of time.
Description:
  
In previous articles I explained jQuery get current page url and title, jQuery get url parameter values, Create tabbed menu with rounded corners using CSS, jQuery shake image on mouse hover and many articles relating to JavaScript, jQuery, asp.net. Now I will explain how to call a JavaScript function for every 5 seconds.

To execute any function repeatedly with fixed time delay for that we have a one function with two parameters called setInterval(functionname, timedelay).
In this function we need to call the required function in functionname field and we need to set the required time delay to execute the function in timedelay field. If you want to see it in example you need to write the code like as shown below
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Run JavaScript function at specific intervals of time</title>
<script type="text/javascript">
var count=0;
function changeColor() {
// Call function with 500 milliseconds gap
setInterval(starttimer, 500);
}
function starttimer() {
count += 1;
var oElem = document.getElementById("divtxt");
oElem.style.color = oElem.style.color == "red" ? "blue" : "red";
document.getElementById("lbltxt").innerHTML = "Your Time Starts: "+count;
}
</script>
</head>
<body>
<div id="divtxt">
<label id="lbltxt" style="font:bold 24px verdana" />
</div>
<button onclick="changeColor();">Start Timer</button>
</body>
</html>

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