//--------function to check the registration form
function validate_fields()
{
	if(document.appoint.textfield.value == "")
	{
		alert("Please Enter First Name");
		document.appoint.textfield.focus();
		return false;
	}
	
	
	
 	if (document.appoint.textfield2.value == "")
	{
		alert ("Please Enter Last Name");
		document.appoint.textfield2.focus();
		return false;
	}

	
	
	if (document.appoint.textfield3.value == "")
	{
		alert ("Please Enter Phone No.");
		document.appoint.textfield3.focus();
		return false;
	}
	
	
	
	var str=document.appoint.textfield4.value
	if (str=="")
	{
		alert ("Please enter an email address.");
		document.appoint.textfield4.focus();
		return false;
	}
	else
	{
		var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
		if (!(filter.test(str) && str.length >= 6 && str.length <= 50))
		{
			alert("Please enter a valid email address. e.g user@domain.com)");
			document.appoint.textfield4.focus();
			return false;
	    }
	}
	
	
	
	if(document.appoint.select_appointment.value == "select")
	{
		alert("Please Select The Appointment Time");
		document.appoint.select_appointment.focus();
		return false;
	}
	
	
	
	if(document.appoint.prefer_contact2.checked=="false" && document.appoint.prefer_contact.checked== "false")
	{
		alert("Please Select Any One Checkbox");
		document.appoint.prefer_contact.focus();
		return false;
	}

return true;
}