var ie5 = (document.all && document.getElementById)? true:false; // ie5+
var ns4 = (document.layers && !document.getElementById) ? true:false;
var ie4 = (document.all) ? true:false;
var ns6 = (document.getElementById && !document.all) ? true:false;
var ypos=0;
var xpos=0;

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

//
//取得中英文字串的總length；
//
function getLength(for_check){
	var I, cnt=0;
	for(I=0;I<for_check.length;I++){
			if(escape(for_check.charAt(I)).length >=4){
				 cnt +=2;
			}else{
				cnt++;
			}
	}	
	return cnt;
}

//
//檢查 是否為合法日期
//
function isDate(strDate) {

  if (strDate.length != 10) return false;

  var year, month, day;
  year = strDate.substring(0,4);
  month = strDate.substring(5,7);
  day = strDate.substring(8,10);

  if(year.length<=0 || month=="" || day=="") return false;
  if (isNaN(year)) return false;
  if (isNaN(month)) return false;

  if (isNaN(day)) return false;

  if (strDate.substring(4,5) != "-" || strDate.substring(7,8) != "-") return false;

  if( month.charAt(0) == '0') month = month.substring(1,2);
  if( day.charAt(0) == '0') day = day.substring(1,2);

  year = parseInt(year,10);
  month = parseInt(month,10);
  day = parseInt(day,10);

  if(year < 1900) return false;
  if(month < 1 || month > 13) return false;
  if(day < 1 || day > 31) return false;

  if(month == 2){
    //
    // 1900 不是閏年，而 2000 是閏年
    //
    if((year/4) != Math.floor(year/4) || year == 1900){
          if(day > 28) return false;
    }
    else{
      if(day > 29) return false;
    }
  }

  //
  // 檢查是否為小月
  // 
  if(month==2 || month==4 || month==6 || month==9 || month==11) {
    if(day > 30) return false;
  }

  return true;
}

/* 取得兩個日期之間所相差的天數
 * 參數日期格式必須為「MM/DD/YYYY」或者「MM-DD-YYYY」，可先使用YMD2MDY()作轉換
 * @param   date1	   開始日期字串1
 * @param   date2	   結束日期字串2
 * @return  integer
 */
function getDiffDay(date1, date2) {
	var laterdate, earlierdate;
	var difference;

	earlierdate = Date.parse(date1);
	laterdate = Date.parse(date2);

	difference = laterdate - earlierdate;

	return Math.floor(difference/1000/60/60/24);
}

/* 將「年月日」的日期格式轉換為「月日年」字串
 * 傳入的日期格式可為「YYYY/MM/DD」或「YYYY-MM-DD」
 * @param   mydate	  欲轉換的日期字串
 * @return  string
 */
function YMD2MDY(mydate) {
	var pos;
	var separator = "-";
	var newdate;

	pos = mydate.indexOf("-");
	if (pos == -1) {
		pos = mydate.indexOf("/");
		separator = "/";
	}

	// IF 不是正確的日期格式 THEN 傳回NaN
	if (pos == -1) {
		return NaN;
	}

	newdate = mydate.substring(pos+1) + separator + mydate.substring(0, pos);

	return newdate;

}
/* 判斷是否為英文字
 * @param   value	   欲檢查的值
 * @return  boolean
 */
function isEng(value) {
	var pattern = /^[A-Za-z\- ]+$/;
	return pattern.test(value);
}

/* 判斷是否為正整數或負整數，例如: +25, -33, 77 皆符合條件
 * @param   value	   欲檢查的值
 * @return  boolean
 */
function isInt(value) {
	var pattern = /^(\+|\-)?\d+$/;
	return pattern.test(value);
}

/* 判斷是否為全為數字，例如: 25, 002 皆符合條件 (有含正號、負號的整數不符合條件)
 * @param   value	   欲檢查的值
 * @return  boolean
 */
function isUnsignedInt(value) {
	var pattern = /^\d+$/;
	return pattern.test(value);
}


/* 檢查指定表單欄位物件的值是否為空值或空白字串，支援所有的表單物件型態 checkbox,
 * radio, select, text, textarea, hidden
 * @param   obj		 表單欄位物件
 * @return  boolean
 */
function isEmpty(obj) {
	var oform = document.forms[0];
	var result = false;
	var obj_name;

	if (typeof(obj) == "string") {
		obj_name = obj;
		obj = oform.elements[obj_name];
		if (typeof(obj) != "object") {
			var valuelist = getCheckBoxListValue(obj_name);
			if (parseInt(valuelist, 10) == 0) {
				return true;
			} else {
				return false;
			}
		}
	}
	
	if (typeof(obj) != "object") {
  		alert("isEmpty: Please give the \"string\" id name to check empty.");
		return false;
	}	

	switch (obj.type) {
		case "select-multiple":
		case "select-one":
			result = !isSelected(obj);
			break;
		case "hidden":
		case "password":
		case "text":
		case "textarea":
			result = isBlank(obj);
			break;
		case "checkbox":
		case "radio":
		default:
			result = !isChecked(obj);
	}

	return result;
}