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Radio button validation in javascript
<form name="form1" action="#" onsubmit="return validateForm()" method="post">

    First time visitor?:<br/>
            <label for="s1">Yes</label>
            <input type="radio" id="1" name="yesno" value="1"/>
            <br/>
            <label for="s2">No</label>
            <input type="radio" id="1" name="yesno" value="2"/>

            <br/>

    <input type="submit" value="Submit"><br/>
    </form>

function validateForm() {
    var radios = document.getElementsByName("yesno");
    var formValid = false;

    var i = 0;
    while (!formValid && i < radios.length) {
        if (radios[i].checked) formValid = true;
        i++;
    }

    if (!formValid) alert("Must check some option!");
    return formValid;
}

document.forms[ 'forms1' ].onsubmit = function() {
    return [].some.call( this.elements, function( el ) {
        if ( el.type === 'radio' ) {
           return el.checked
        }
        else {
           return false
        }
    } )
}