function isBlank(s)
{
	var len=s.length
	var i
	for(i=0;i<len;++i)
	{
		if(s.charAt(i)!=" ") return false
	}

	return true
}

function validate(fieldName,fieldValue)
{
	if(isBlank(fieldValue))
	{
		alert(fieldName+" cannot be left blank.")
		return false
	}

	if (fieldName="The email field")
	{
		  if (document.feedback.user_email.value.indexOf("@")<2)
		  {
			   alert("Please check your email address");
			   document.feedback.user_email.value="";
			   return false;
		  }
	}
	return true
}

function validateForm()
{
	if(!validate("The name field",document.feedback.user_name.value)) return false
	if(!validate("The e-mail field",document.feedback.user_email.value)) return false
	if(!validate("The comments field",document.feedback.comments.value)) return false
}

function validateEmail()
{
	validate("The email field",document.feedback.user_email.value)
}