function checkextraform(){
 
	var namestr;
	var emailstr;
 
	namestr = document.forms.extracontent.name.value;
	emailstr = document.forms.extracontent.email.value;
 
 
	if (namestr == ""){
		alert('You must enter a name before proceeding.');
		return false;
	}
 
 
 
	if (emailstr == ""){
		alert('You must enter an email address before proceeding.')
		return false;
	}
	
	var len;
	var at;
	
	len = emailstr.length;
	at = false;
	for (i=0; i<len; i++)
	{
		if (emailstr.charAt(i).match(/[0-9|a-z|A-Z|@|_|.|-]/) == null)
		{
			alert('Please enter a valid email address.\n\n Your email address must not contain any non alphanumeric characters other than _ - . @');
			return false;
		}
		if (emailstr.charAt(i).match(/[@]/) != null)
		{
			if (at)
			{
				alert('Please enter a valid email address.\n\n You cannot have more than one @ in your email address.')
				return false;
			}
			at = true;
			if (emailstr.charAt(i - 1).match(/[.]/) != null || emailstr.charAt(i + 1).match(/[.]/))
			{
				alert('Please enter a valid email address.\n\n There must be a character seperating the @ and the . on your email address.');
				return false;
			}
		}
	}
 
	if (!checkextraEmail(emailstr))
	{
		alert('Please enter a valid email address.')
		return false;
	}
 
	return true;
}
 
function checkextraEmail(strng){
	var emailFilter=/^.+@.+\..{2,4}$/;
 
	if (!(emailFilter.test(strng))) 
		return false;
	return true;
}