//
// +----------------------------------------------------------------------+
// |zen-cart Open Source E-commerce                                       |
// +----------------------------------------------------------------------+
// | Copyright (c) 2003 The zen-cart developers                           |
// |                                                                      |   
// | http://www.zen-cart.com/index.php                                    |   
// |                                                                      |   
// | Portions Copyright (c) 2003 osCommerce                               |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the GPL license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available through the world-wide-web at the following url:           |
// | http://www.zen-cart.com/license/2_0.txt.                             |
// | If you did not receive a copy of the zen-cart license and are unable |
// | to obtain it through the world-wide-web, please send a note to       |
// | license@zen-cart.com so we can mail you a copy immediately.          |
// +----------------------------------------------------------------------+
// $Id: general.js 1105 2005-04-04 22:05:35Z birdbrain $
//

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;
}