function isEmailAddr(email) {
	var result = false;
	var theStr = new String(email);
	var index = theStr.indexOf("@");

	if (index > 0) {
		var pindex = theStr.indexOf(".",index);
		if ((pindex > index+1) && (theStr.length > pindex+1)) { result = true; }
	}

	return result;
}



function validRequired(formField,fieldLabel) {
	var result = true;
	
	if (formField.value == "") {
		alert('Please enter a value for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}
	
	return result;
}



function allDigits(str) {
	return inValidCharSet(str,"0123456789");
}



function inValidCharSet(str,charset) {
	var result = true;
	
	for (var i=0;i<str.length;i++) {
		if (charset.indexOf(str.substr(i,1))<0) {
			result = false;
			break;
		}
	}
	
	return result;
}



function validEmail(formField,fieldLabel,required) {
	var result = true;
	
	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) ) {
		alert("Please enter a complete email address in the form: yourname@yourdomain.com");
		formField.focus();
		result = false;
	}
   
	return result;
}



function validNum(formField,fieldLabel,required) {
	var result = true;

	if (required && !validRequired(formField,fieldLabel)) { result = false; }
  
 	if (result) {
 		if (!allDigits(formField.value)) {
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();
			result = false;
		}
	} 
	
	return result;
}



function validZip(formField,fieldLabel,required) {
	var result = true;

	if (required && !validRequired(formField,fieldLabel)) { result = false; }

 	if (result) {
 		if ((!allDigits(formField.value)) || (formField.value < 0) || (formField.value > 99999)) {
			alert('Please enter a valid zip code');
			formField.focus();		
			result = false;
 		}
	} 

	return result;
}



function validInt(formField,fieldLabel,required) {
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result) {
 		var num = parseInt(formField.value,10);
 		if (isNaN(num)) {
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}



function validDate(formField,fieldLabel,required) {
	var result = true;

	if (required && !validRequired(formField,fieldLabel)) { result = false; }
  
 	if (result) {
 		var elems = formField.value.split("/");
 		
 		result = (elems.length == 3); // should be three components
 		
 		if (result) {
 			var month = parseInt(elems[0],10);
  			var day   = parseInt(elems[1],10);
 			var year  = parseInt(elems[2],10);
			result    = allDigits(elems[0]) && (month > 0) && (month < 13) &&
			            allDigits(elems[1]) && (day > 0) && (day < 32) &&
			            allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}
 		
  		if (!result) {
 			alert('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 
	
	return result;
}




function validRadioButton(formField,fieldLabel) {
	var result = false;

	for (i=0;i<formField.length;i++) {
		if (formField[i].checked) {
			result = true;
		}
	}
	
	if (!result) {
		alert('Please choose an answer for ' + fieldLabel);
		formField[0].focus();
	}
	
	return result;
}



function radioValue(formField) {
	var value = "";

	for(var k=0; k < formField.length; k++) {
		if (formField[k].checked) { value = formField[k].value; }
	}

	return value;
}



// -------------------------------------------------------------------------
// ------------------- Individual Forms Validation Rules -------------------
// -------------------------------------------------------------------------

// Validation for the Search form
function supppackForm(theForm) {
	if (!validRequired(theForm.first_name,"First Name")) { return false; }
	if (!validRequired(theForm.last_name,"Last Name"))   { return false; }
	if (!validEmail(theForm.email,"Email"))              { return false; }
	if (!validRequired(theForm.school,"School"))         { return false; }
	if (!validZip(theForm.zip,"Zip Code"))               { return false; }

	return true;
}


// /kids/activities/challenge.asp
function kidsChallengeForm(theForm) {
	if (!validRequired(theForm.toname,"Your Friend's Name"))  { return false; }
	if (!validEmail(theForm.toemail,"Your Friend's Email"))   { return false; }
	if (!validRequired(theForm.fname,"Your Name"))            { return false; }
}