<script language="javascript" type="text/javascript">
 function showError(txt){
    document.getElementById('regFormError').innerHTML = txt;
    document.getElementById('regFormError').style.visibility = 'visible';
    }

    function check(){
    var str = '';
    if (document.getElementById('name').value == '' )
    {
    showError('Please enter your name');
    str=str+'Please enter your name';
    }
var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
    var myString = document.getElementById('email').value;
    if( myString == '' || !emailPattern.test(myString)){
    showError('Please enter valid email');
    str=str+'Please enter valid email';
    }
    if (document.getElementById('company').value == ''){
    showError('Please enter your company name');
    str=str+'Please enter your company name';
    }
    if( document.getElementById('comments').value == ''){
    showError('Please write your comments');
    str=str+'Please write your comments';
    }
    if (str!=='')  return false; elt.innerHTML = str;
    return true;
    }
</script>