function checkLoginForm() {
	var username = document.forms.LF_login.user;
	var password = document.forms.LF_login.pwd;

	if ( username.value == '' ) { alert ('Please provide a user name'); username.focus(); return false; }
	if ( password.value == '' ) { alert ('Please provide a password '); password.focus(); return false; }
	return true;
}

function checkSurvey() {
	var frm = document.forms['surveyForm'].elements;
	var len = frm.length - 6;

	var details	= document.forms.surveyForm;
	var contact	= details.contact;
	var company	= details.company;
	var position	= details.position;
	var business	= details.business;
	var email	= details.email;

	for (i = 0; i<len; i+=3)
	{
		if ( ((frm[i].type == 'radio') && (!frm[i].checked)) &&
			((frm[i+1].type == 'radio') && (!frm[i+1].checked)) &&
			((frm[i+2].type == 'radio') && (!frm[i+2].checked)) )
		{
			alert('Please ensure that all questions are answered');
			frm[i].focus();
			return false;
		}
	}

	if ( contact.value == '' )	{ alert ('Please provide your contact name'); contact.focus(); return false; }
	if ( company.value == '' )	{ alert ('Please provide your company name'); company.focus(); return false; }
	if ( position.value == '' )	{ alert ('Please provide your position'); position.focus(); return false; }
	if ( business.value == '' )	{ alert ('Please provide your business type'); business.focus(); return false; }
	if ( email.value == '' )	{ alert ('Please provide your email address'); email.focus(); return false; }

	if ( email.value.indexOf("@") == -1 ) { alert ('Invalid email address, please correct the field'); email.focus(); return false; }

	return true;
}

function change(size) {
	document.body.className = 'body' + size; 
}

function checkJoinForm() {
	var contact	= document.forms.joinForm.contact;
	var company	= document.forms.joinForm.company;
	var email	= document.forms.joinForm.email;
	var telephone	= document.forms.joinForm.telephone;

	if ( contact.value == '' )	{ alert ('Please provide a contact name');     contact.focus();   return false; }
	if ( company.value == '' )	{ alert ('Please provide a company name');     company.focus();   return false; }
	if ( email.value == '' )	{ alert ('Please provide an email address');   email.focus();	  return false; }
	if ( telephone.value == '' )	{ alert ('Please provide a telephone number'); telephone.focus(); return false; }
	if ( email.value.indexOf("@") == -1 ) { alert ('Invalid email address, please correct the field'); email.focus(); return false; }
	return true;
}

function checkNewsForm() {
	var contact	= document.forms.newsForm.contact;
	var company	= document.forms.newsForm.company;
	var email	= document.forms.newsForm.email;
	var position	= document.forms.newsForm.position;
	var business	= document.forms.newsForm.business;

	if ( contact.value == '' )	{ alert ('Please provide a contact name');     contact.focus();  return false; }
	if ( company.value == '' )	{ alert ('Please provide a company name');     company.focus();  return false; }
	if ( position.value == '' )	{ alert ('Please provide your position');      position.focus(); return false; }
	if ( business.value == '' )	{ alert ('Please provide a business type');    business.focus(); return false; }
	if ( email.value == '' )	{ alert ('Please provide an email address');   email.focus();	 return false; }
	if ( email.value.indexOf("@") == -1 ) { alert ('Invalid email address, please correct the field'); email.focus(); return false; }
	return true;
}