// return integer portion of input
function GetIntValue(string) {
	var numString = '';
	var regEx =  /^[0-9]/;
	for (var i=0; i<string.length; i++) {
		var thisChar = string.charAt(i);
		if (regEx.test(thisChar)) numString += string.charAt(i);
		}
	return numString;
	}

// check for integer-only input
function MPIntOnlyField(thisField) {
	var testVal = thisField.value;
	var fixedVal = GetIntValue(testVal);
	if (testVal.length > fixedVal.length) alert('Please enter numbers only');
	thisField.value = fixedVal;
	}

// disable or enable verse and chapter fields based on book selection
function MPChapterVerse() {
	with (document.SearchForm) {
		if (book.options[book.selectedIndex].value == "") {
			chapter.value = "";
			chapter.disabled = true;
			verse.value = "";
			verse.disabled = true;
			} else {
			chapter.disabled = false;
			verse.disabled = false;
			}
		}
	}