function check(myForm) {


        var alphaExp = /^[a-zA-Z" "]+$/;
        if(myForm.txtName.value.match(alphaExp)){

        }
        else{
            alert("Please enter valid Name.");
            myForm.txtName.focus();
            return false;
        }

         if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(myForm.txtEmail.value)){

        }
        else{
            alert("Invalid E-mail Address! Please re-enter.");
            myForm.txtEmail.focus();
            return (false);
        }

/*
        var alphaExp = /^[a-zA-Z0-9_" "&.;:?<>,@!$*]+$/;
        if(myForm.txtComments.value.match(alphaExp)){

        }
        else{
            alert("Please enter valid Comments.");
            myForm.txtComments.focus();
            return false;
        }
*/
        return true;
}

	<!--
	function new_captcha()
	{
	var c_currentTime = new Date();
	var c_miliseconds = c_currentTime.getTime();
	
	document.getElementById('captcha').src = 'captcha/image.php?x='+ c_miliseconds;
	}
	-->