function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		
		if (str.indexOf(at)==-1)
		{
		   alert("Please enter a valid e-mail address.")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
		{
		   alert("Please enter a valid e-mail address.")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
		{
		    alert("Please enter a valid e-mail address.")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1)
		 {
		    alert("Please enter a valid e-mail address.")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
		 {
		    alert("Please enter a valid e-mail address.")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1)
		 {
		    alert("Please enter a valid e-mail address.")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1)
		 {
		    alert("Your e-mail address is invalid. Please re-enter your e-mail address without spaces (e.g. ndtac@air.org).")
		    return false
		 }

 		 return true					
	}


function verifyRequired() {
  if (document.eventRegister.prime_email.value == "") {
    alert("The 'E-mail' field is required.")
	window.location = "#block_contact";
    return false;
  }
  if (document.eventRegister.email_confirm.value == "") {
    alert("The 'E-Mail Confirmation' field is required.")
	window.location = "#block_contact";
    return false;
  }
  if (echeck(document.eventRegister.prime_email.value)==false)
	{
		document.eventRegister.prime_email.focus()
		window.location = "#block_registrant_contact";
		return false;
	}
	
  if (echeck(document.eventRegister.email_confirm.value)==false)
	{
		document.eventRegister.email_confirm.focus()
		window.location = "#block_registrant_contact";
		return false;
	}
  if (document.eventRegister.prime_email.value != document.eventRegister.email_confirm.value) {
    alert("Please check that the email addresses match.")
	window.location = "#block_contact";
    return false;
  }
  if (document.eventRegister.prime_fname.value == "") {
    alert("The 'First Name' field is required.")
	window.location = "#block_basics";
    return false;
  }
  if (document.eventRegister.prime_lname.value == "") {
    alert("The 'Last Name' field is required.")
	window.location = "#block_basics";
    return false;
  }
  if (document.eventRegister.prime_title.value == "") {
    alert("The 'Title' field is required.")
	window.location = "#block_basics"
    return false;
  }
  if (document.eventRegister.prime_org.value == "") {
    alert("The 'Organization' field is required.")
	window.location = "#block_basics"
    return false;
  }
  if (document.eventRegister.prime_fips.value == "0") {
    alert("The 'State' field is required.")
	window.location = "#block_basics";
    return false;
  }
  if (document.eventRegister.recaptcha_response_field.value == "") {
    alert("The 'SPAM Blocker' field is required.")
	window.location = "#block_spam"
    return false;
  }
  if (document.eventRegister.prime_address1.value == "") {
    alert("The 'Address' field is required.")
	window.location = "#block_basics";
    return false;
  }
  if (document.eventRegister.prime_city.value == "") {
    alert("The 'City' field is required.")
	window.location = "#block_basics";
    return false;
  }
  if (document.eventRegister.prime_zip.value == "") {
    alert("The 'Zip' field is required.")
	window.location = "#block_basics";
    return false;
  }
  if (document.eventRegister.prime_phone.value == "") {
    alert("The 'Phone' field is required.")
	window.location = "#block_contact";
    return false;
  }
  if (document.eventRegister.paes2010_afternoon[0].checked == true) {
		if (document.eventRegister.elements['paes2010_sessions[]'][0].checked == false && document.eventRegister.elements['paes2010_sessions[]'][1].checked == false && document.eventRegister.elements['paes2010_sessions[]'][2].checked == false && document.eventRegister.elements['paes2010_sessions[]'][3].checked == false && document.eventRegister.elements['paes2010_sessions[]'][4].checked == false && document.eventRegister.elements['paes2010_sessions[]'][5].checked == false) {
		alert("The 'Conference Sessions' question is required.");
		window.location = "#block_attendance";
		return false;
		}
  }
	if (document.eventRegister.agreement.checked == false || document.eventRegister.agreement_gov.checked == false) {
    alert("You must agree to the terms.")
	window.location = "#agreement";
    return false;
  }
return true;
}