///////////////////////////////////////////////////////

// JavaScript form validation functions script  

///////////////////////////////////////////////////////



function isBlank(Ctrl) {  // returns true if blank	

	if (Ctrl.value.length < 1)

		return true;

	else if (isEmpty(Ctrl.value))

		return true;

	else return false;

}



function isEmpty(s) { // prevents entering empty strings

	for (var i = 0; i < s.length; i++) {

		var c = s.charAt(i);

		if ((c != ' ') && (c != '\n') && (c != '\t')) return false; 

	}

	return true;

}



function isSpacey(s) { // prevents entering strings with spaces

	for (var i = 0; i < s.length; i++) {

		var c = s.charAt(i);

		if (c == ' ') return true; 

	}

	return false;

}



function isTooShort(Ctrl,num) {

	if (Ctrl.value.length < num)

		return true;

	else return false;

}



function isNotANumber(Ctrl) {  // returns true if not a number

	if (isNaN(Ctrl.value))

		return true;

	else return false;

}



function isChecked(Ctrl) {

	if (Ctrl.checked) return true;

	else return false;

}



// for multiple checkboxes with same name, true if at least one is checked

function isCheckedByLength(Ctrl) {	

	var boxIsChecked = false;

	for (i=0; i < Ctrl.length; i++) {

		if (Ctrl[i].checked) { 

			boxIsChecked = true;

			break;

		}

	}

	if (boxIsChecked) return true;

	else return false;

}



function isSelected(Ctrl, index){  // returns true if the index indicated is selected

	if (Ctrl.options[index].selected)

		return true;

	else return false;

}



function isSelectedOrHigher(Ctrl, upLimit){ // works with numerically-valued select options only!

	var ctrlValue = Ctrl.options[Ctrl.selectedIndex].value;

	if (ctrlValue > upLimit)

		return true;

	else return false;

}



function isSelectedRange(Ctrl, loLimit, upLimit){ // works with numerically-valued select options

	var ctrlRangeValue = Ctrl.options[Ctrl.selectedIndex].value;

	if (!(ctrlRangeValue > loLimit && Ctrl.value < upLimit))

		return true;

	else return false;

}



function isSelectedValue(Ctrl, myValue){ 

	var ctrlRangeValue = Ctrl.options[Ctrl.selectedIndex].value;

	if (ctrlRangeValue == myValue)

		return true;

	else return false;

}



function isUSZipCode(Ctrl) {  // returns true if properly formatted zip code

	zipString = Ctrl.value;

	if (zipString.length == 5) {

		if (isNaN(zipString)) return false;

		else return true;

	} else if (zipString.length < 5) {

		return false;

	} else if ( 

	   zipString.length < 10 ||

	   isNaN( zipString.substring(0,5) ) || 

	   isNaN( zipString.substring(6,10) ) ||

	   (zipString.substring(5,6) != '-') 

		) {

			return false;

	} 	

	else 

		return true;

}	// end isUSZipCode()



function isEmail(Ctrl) {  // returns true if valid e-mail address

	var err=0;

	emailString = Ctrl.value;

	if (emailString.indexOf("@",1) == -1) err=1;  // need @ symbol

	if (emailString.indexOf(".",3) == -1) err=1;  // need at least one "."

	if (emailString.lastIndexOf(".") == (emailString.length-1)) err=1;  // can't end with a "."

	// check length

	if (err==0) {

		var at = (emailString.indexOf("@"))+1;

		var lastDot = (emailString.lastIndexOf("."))+1;

		// test to make sure there's at least one character between "at" and "lastDot"

		if (lastDot - at == 1) err=1;

	}

	if (err==1) return false;

	else return true;

	

}	// end testSimpleEmail()