setting up form validation and captcha in asp. net storefront (topic forms)

<script type="text/javascript">
 
function formValidator(){
	// Make quick references to our fields
	var Name = document.getElementById('Name');
	var Phone = document.getElementById('Phone');
	var Email = document.getElementById('Email');
	
	// Check each input in the order that it appears in the form!
	if(notEmpty(Name, "The Name field is required and must be filled out")){
	if(notEmpty(Phone, "The Phone field is required and must be filled out")){
	if(notEmpty(Email, "The Email field is required and must be filled out")){
	if(isAlphabet(Name, "Please enter only letters for your name")){
		if(isNumeric(Phone, "Numbers Only for Phone")){
						if(emailValidator(Email, "Please enter a valid email address")){
							return true;
						}
					}
				}
				}
				}
				}
	
	return false;
	
}
 
function notEmpty(elem, helperMsg){
	if(elem.value.length == 0){
		alert(helperMsg);
		elem.focus(); // set the focus to this input
		return false;
	}
	return true;
}
 
function isNumeric(elem, helperMsg){
	var numericExpression = /^[0-9-]+$/;
	if(elem.value.match(numericExpression)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}
 
function isAlphabet(elem, helperMsg){
	var alphaExp = /^[a-zA-Z' ']+$/;
	if(elem.value.match(alphaExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}
 
function emailValidator(elem, helperMsg){
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	if(elem.value.match(emailExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}
    </script>
 
            If you would like to contact a specific store, <b><a href="t-locations.aspx" target="_self">
                click here</a></b> for location contact information.</span></span><br>
    <hr size="1">
    <b>Or, use the form below to send us a message</b><br>
    <br>
    <form id="FORM1" onsubmit="return formValidator()" action="sendform.aspx">
    <div align="left">
        <table border="0" cellspacing="0" cellpadding="0" width="454">
            <tbody>
                <tr>
                    <td valign="top" width="102" align="right">
                        Your Name:
                    </td>
                    <td valign="center" width="348" align="left">
                        <input size="27" name="Name">
                    </td>
                </tr>
                <tr>
                    <td valign="top" width="102" align="right">
                        Your Phone:
                    </td>
                    <td valign="center" width="348" align="left">
                        <input size="27" name="Phone">
                    </td>
                </tr>
                <tr>
                    <td valign="top" width="102" align="right">
                        Your E-Mail:
                    </td>
                    <td valign="center" width="348" align="left">
                        <input size="27" name="Email">
                    </td>
                </tr>
                <tr>
                    <td valign="top" width="102" align="right">
                        Subject:
                    </td>
                    <td valign="center" width="348" align="left">
                        <input size="27" name="Subject">
                    </td>
                </tr>
                <tr>
                    <td valign="top" width="102" align="right">
                        Message:
                    </td>
                    <td valign="center" width="348" align="left">
                        <textarea name="S1" cols="41" rows="11"></textarea>
                    </td>
                </tr>
                <tr>
                    <td width="102">
                    </td>
                    <td width="348">
                        <input type="submit" value="Submit" onclick="return formValidator()" />
                    </td>
                </tr>
            </tbody>
        </table>
    </div>
    </form>

                                  

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