/*

  $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;

}