/* -----------------------------------------------------------------------------------------
$Id: general.js 899 2005-04-29 02:40:57Z hhgag $

XT-Commerce - community made shopping
http://www.xt-commerce.com

Copyright (c) 2003 XT-Commerce
-----------------------------------------------------------------------------------------
based on:
(c) 2000-2001 The Exchange Project  (earlier name of osCommerce)
(c) 2002-2003 osCommerce(general.js,v 1.3 2003/02/10); www.oscommerce.com
(c) 2003	 nextcommerce (general.js,v 1.3 2003/08/13); www.nextcommerce.org

Released under the GNU General Public License
---------------------------------------------------------------------------------------*/

function SetFocus(TargetFormName) {
var target = 0;
if (TargetFormName != "") {
for (i=0; i<document.forms.length; i++) {
if (document.forms[i].name == TargetFormName) {
target = i;
break;
}
}
}

var TargetForm = document.forms[target];

for (i=0; i<TargetForm.length; i++) {
if ( (TargetForm.elements[i].type != "image") && (TargetForm.elements[i].type != "hidden") && (TargetForm.elements[i].type != "reset") && (TargetForm.elements[i].type != "submit") ) {
TargetForm.elements[i].focus();

if ( (TargetForm.elements[i].type == "text") || (TargetForm.elements[i].type == "password") ) {
TargetForm.elements[i].select();
}

break;
}
}
}

function RemoveFormatString(TargetElement, FormatString) {
if (TargetElement.value == FormatString) {
TargetElement.value = "";
}

TargetElement.select();
}

function CheckDateRange(from, to) {
if (Date.parse(from.value) <= Date.parse(to.value)) {
return true;
} else {
return false;
}
}

function IsValidDate(DateToCheck, FormatString) {
var strDateToCheck;
var strDateToCheckArray;
var strFormatArray;
var strFormatString;
var strDay;
var strMonth;
var strYear;
var intday;
var intMonth;
var intYear;
var intDateSeparatorIdx = -1;
var intFormatSeparatorIdx = -1;
var strSeparatorArray = new Array("-"," ","/",".");
var strMonthArray = new Array("jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec");
var intDaysArray = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

strDateToCheck = DateToCheck.toLowerCase();
strFormatString = FormatString.toLowerCase();

if (strDateToCheck.length != strFormatString.length) {
return false;
}

for (i=0; i<strSeparatorArray.length; i++) {
if (strFormatString.indexOf(strSeparatorArray[i]) != -1) {
intFormatSeparatorIdx = i;
break;
}
}

for (i=0; i<strSeparatorArray.length; i++) {
if (strDateToCheck.indexOf(strSeparatorArray[i]) != -1) {
intDateSeparatorIdx = i;
break;
}
}

if (intDateSeparatorIdx != intFormatSeparatorIdx) {
return false;
}

if (intDateSeparatorIdx != -1) {
strFormatArray = strFormatString.split(strSeparatorArray[intFormatSeparatorIdx]);
if (strFormatArray.length != 3) {
return false;
}

strDateToCheckArray = strDateToCheck.split(strSeparatorArray[intDateSeparatorIdx]);
if (strDateToCheckArray.length != 3) {
return false;
}

for (i=0; i<strFormatArray.length; i++) {
if (strFormatArray[i] == 'mm' || strFormatArray[i] == 'mmm') {
strMonth = strDateToCheckArray[i];
}

if (strFormatArray[i] == 'dd') {
strDay = strDateToCheckArray[i];
}

if (strFormatArray[i] == 'yyyy') {
strYear = strDateToCheckArray[i];
}
}
} else {
if (FormatString.length > 7) {
if (strFormatString.indexOf('mmm') == -1) {
strMonth = strDateToCheck.substring(strFormatString.indexOf('mm'), 2);
} else {
strMonth = strDateToCheck.substring(strFormatString.indexOf('mmm'), 3);
}

strDay = strDateToCheck.substring(strFormatString.indexOf('dd'), 2);
strYear = strDateToCheck.substring(strFormatString.indexOf('yyyy'), 2);
} else {
return false;
}
}

if (strYear.length != 4) {
return false;
}

intday = parseInt(strDay, 10);
if (isNaN(intday)) {
return false;
}
if (intday < 1) {
return false;
}

intMonth = parseInt(strMonth, 10);
if (isNaN(intMonth)) {
for (i=0; i<strMonthArray.length; i++) {
if (strMonth == strMonthArray[i]) {
intMonth = i+1;
break;
}
}
if (isNaN(intMonth)) {
return false;
}
}
if (intMonth > 12 || intMonth < 1) {
return false;
}

intYear = parseInt(strYear, 10);
if (isNaN(intYear)) {
return false;
}
if (IsLeapYear(intYear) == true) {
intDaysArray[1] = 29;
}

if (intday > intDaysArray[intMonth - 1]) {
return false;
}

return true;
}

function IsLeapYear(intYear) {
if (intYear % 100 == 0) {
if (intYear % 400 == 0) {
return true;
}
} else {
if ((intYear % 4) == 0) {
return true;
}
}

return false;
}