/*
  $Id: general.js,v 1.3 2003/02/10 22:30:55 hpdl Exp $

  osCommerce, Open Source E-Commerce Solutions
  http://www.oscommerce.com

  Copyright (c) 2003 osCommerce

  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;
}