Write a JavaScript function, to check string is palindrome or not.
<html>
<head>
<title>
Palindrome
</title>
<script type="text/javascript">
function checkInput(){
var str = document.form1.palindrome.value;
palindrome(str);
}
function reverse_string(str){
var stri = "";
var alen = str.length;
for (var i = alen ; i > 0 ; i--){
stri += str.charAt(i-1)
}
return stri;
}
function palindrome(str){
if(str == reverse_string(str))
alert("palindrome");
else
alert("Not Palindrome");
}
</script>
</head>
<body>
<form name="form1">
Text: <input type="text" name="palindrome" />
<br /><input type="button" value="Check" onclick = "checkInput()" />
</form>
</body>
</html>