function getQueryVariable(variable) {
  var query = window.location.search.substring(1);
  var vars = query.split("&");
  for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      return pair[1];
    }
  } 
}

function validateForm(form) {
	var firstName = form["first_name"].value;
	var lastName = form["last_name"].value;
	var email = form["email"].value;
	var errRequiredFields = new Array();
	var errMessage = 'Please fill out the following fields:';
	
	if (!firstName.length) errRequiredFields.push('First Name');
	if (!lastName.length) errRequiredFields.push('Last Name');
	if (!email.length) errRequiredFields.push('Email');
	
	if (errRequiredFields.length) {
		for (var i=0; i<errRequiredFields.length; ++i) {
			errMessage = errMessage + '\n- ' + errRequiredFields[i];
		}
		alert(errMessage);
		return false;
	}
	
	return true;
}

function init() {
	var cbFranchise = document.getElementById('interest_franchise');
	var cbFundraising = document.getElementById('interest_fundraising');
	var cbMailingList = document.getElementById('interest_mailinglist');
	var cbLicense = document.getElementById('interest_license');
	var cbGifts = document.getElementById('interest_gifts');
	
	if (cbFranchise != null && getQueryVariable('interest') == 'franchise') {
		cbFranchise.checked = true;
	}
	if (cbFundraising != null && getQueryVariable('interest') == 'fundraising') {
		cbFundraising.checked = true;
	}
	if (cbMailingList != null && getQueryVariable('interest') == 'mailinglist') {
		cbMailingList.checked = true;
	}
	if (cbLicense != null && getQueryVariable('interest') == 'license') {
		cbLicense.checked = true;
	}
	if (cbGifts != null && getQueryVariable('interest') == 'gifts') {
		cbGifts.checked = true;
	}
}