CODE EXAMPLE FOR JAVASCRIPT

document.getelementsbyname

/*
The document.getElementsByName() method returns all the element 
of specified name.
*/

// Syntax : document.getElementsByName("name")  

<script type="text/javascript">  
function totalelements()  
{  
var allgenders=document.getElementsByName("gender");  
alert("Total Genders:"+allgenders.length);  
}  
</script>  
<form>  
Male:<input type="radio" name="gender" value="male">  
Female:<input type="radio" name="gender" value="female">  
  
<input type="button" onclick="totalelements()" value="Total Genders">  
</form>