<!--form validation functions-->
 function IsEmpty(aTextField) {
   if ((aTextField.length==0) ||
   (aTextField==null)) {
      return true;
   }
   else { return false; }
}

function isValidEmail(str) {
   return (str.indexOf(".") > 0) && (str.indexOf("@") > 0);
 
}

function IsAlpha(aText)
{
   var aValidChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ";
   var IsAlpha=true;
   var Char;

 
   for (a = 0; a < aText.length && IsAlpha == true; a++) 
      { 
      Char = aText.charAt(a); 
      if (aValidChars.indexOf(Char) == -1) 
         {
         IsAlpha = false;
         }
      }
   return IsAlpha;
   
   }
   
function IsNumeric(sText)
{
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
   }
  function IsCCNum(sText)
	{
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
		if(sText.length != 16)
		{
			IsNumber = false;
		}
      }
   return IsNumber;
   
   }
   
   function IsZip(sText)
	{
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
		if(sText.length != 5)
		{
			IsNumber = false;
		}
      }
   return IsNumber;
   
   }
   
   function IsPhone(sText)
	{
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
		if(sText.length != 10)
		{
			IsNumber = false;
		}
      }
   return IsNumber;
   
   }

<!--end form validation functions-->

function checkRegForm() {
	
	if (IsEmpty(document.registerForm.username.value)){
		alert("Please enter desired username");
		document.registerForm.username.focus();
	} else
	if (document.registerForm.pwchk.value == 'bad') {
		alert("Your username is already taken");
		document.registerForm.username.focus();
	} else
	if (IsEmpty(document.registerForm.pw.value)){
		alert("Please enter desired password");
		document.registerForm.pw.focus();
	} else
	if (IsEmpty(document.registerForm.confpassword.value)){
		alert("Please confirm password");
		document.registerForm.confpassword.focus();
	} else
	if (document.registerForm.password.value != document.registerForm.confpassword.value){
		alert("Your password and confirmation don't match");
		document.registerForm.password.focus();
	} else
	if (IsEmpty(document.registerForm.first.value)){
		alert("Please enter your first name");
		document.registerForm.first.focus();
	} else
	if (IsEmpty(document.registerForm.last.value)){
		alert("Please enter your last name");
		document.registerForm.last.focus();
	} else
	if (!isValidEmail(document.registerForm.email.value)){
		alert("Please enter a valid email");
		document.registerForm.email.focus();
	} else
	if (document.registerForm.district.selectedIndex == 0) {
		alert("Please choose your district");
	} else
	if (document.registerForm.school.selectedIndex == 0) {
		alert("Please choose your school");
	} else
	if (IsEmpty(document.registerForm.numstudents.value)) {
		alert("Please enter your number of students");
		document.registerForm.numstudents.focus();
	} else
	if (!IsNumeric(document.registerForm.numstudents.value)) {
		alert("Please enter a numeric value for number of students");
		document.registerForm.numstudents.focus();
	} else
	if (IsEmpty(document.registerForm.stuUser.value)) {
		alert("Please enter	desired student username");
		document.registerForm.stuUser.focus();
	} else
	if (IsEmpty(document.registerForm.stuPass.value)) {
		alert("Please enter desired student password");
		document.registerForm.stuPass.focus();
	} else
	if (IsEmpty(document.registerForm.stuConfPass.value)) {
		alert("Please confirm student pasword");
		document.registerForm.stuConfPass.focus();
	} else
	if (document.registerForm.stuPass.value != document.registerForm.stuConfPass.value) {
		alert("Your sudent password	and confirmation don't match");
		document.registerForm.stuPass.focus();
	} else
	if (document.registerForm.orderYear.checked == 0 && document.registerForm.otherDate.value == '') {
		alert("Please select subscription end date");
	} else
	if (document.registerForm.DMN.checked == 0 && document.registerForm.SLT.checked == 0) {
		alert("Please select paper(s) for your subscription");
	} else {
		document.registerForm.submit();
	} 	
}

function checkContact() {
	if(IsEmpty(document.contact.name.value)) {
		alert("Please Enter Your Name");	
	} else if(!isValidEmail(document.contact.email.value)) {
		alert("Please Enter a Valid Email");	
	} else if(IsEmpty(document.contact.subject.value)) {
		alert("Please Enter a Subject");	
	} else if(document.contact.message.value == '') {
		alert("Please Enter a Message");	
	} else {
		document.contact.submit();	
	}
}