<!--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;
   
   }
function validateForm(){
	if (IsEmpty(document.contest.name.value)){
		alert("Please Add Name");
		document.contest.name.focus();
		return false;
	}
	else if (!isValidEmail(document.contest.email.value) || IsEmpty(document.contest.email.value)){
		alert("Please Add Valid Email");
		document.contest.email.focus();
		return false;
	}
	else if (IsEmpty(document.contest.district.value)){
		alert("Please Add District");
		document.contest.district.focus();
		return false;
	}
	else if (IsEmpty(document.contest.school.value)){
		alert("Please Add School");
		document.contest.school.focus();
		return false;
	}
	else if (document.contest.grade.value == ''){
		alert("Please Select Grade");
		document.contest.grade.focus();
		return false;
	}
	else if (IsEmpty(document.contest.address.value)){
		alert("Please Add Address");
		document.contest.address.focus();
		return false;
	}
	else if (IsEmpty(document.contest.city.value)){
		alert("Please Add City");
		document.contest.city.focus();
		return false;
	}
	else if (!IsPhone(document.contest.phone.value) || IsEmpty(document.contest.phone.value)){
		alert("Phone number is missing or invalid. Please enter your 10 digit phone number ie:8015551234");
		document.contest.phone.focus();
		return false;
	}
	else if (!IsNumeric(document.contest.students.value) || IsEmpty(document.contest.students.value)){
		alert("# of Students is missing or invalid");
		document.contest.students.focus();
		return false;
	}
	else { return true; }

}
<!--end form validation functions-->