//document.all('image_type').style.display='none';
function isEmail (s)
{   
	if (isEmpty(s)) 
		if (isEmail.arguments.length == 1) return false;
		else return (isEmail.arguments[1] == true);
		
  if (isWhitespace(s)) return false;
  
  var i = 1;
  var sLength = s.length;

  while ((i < sLength) && (s.charAt(i) != "@"))
  { i++
  }

  if ((i >= sLength) || (s.charAt(i) != "@")) return false;
  else i += 2;

  while ((i < sLength) && (s.charAt(i) != "."))
  { i++
  }
  		
	/*if ((s.indexOf(".com")<5)&&(s.indexOf(".org")<5)
		&&(s.indexOf(".gov")<5)&&(s.indexOf(".net")<5)
		&&(s.indexOf(".mil")<5)&&(s.indexOf(".edu")<5))
	{
		return false;
	}*/

  if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
  else return true;
}

function isWhitespace (s)
{   
	var whitespace = " \t\n\r";
	var i;

  if (isEmpty(s)) return true;
  for (i = 0; i < s.length; i++)
  {   
    var c = s.charAt(i);
    if (whitespace.indexOf(c) == -1) return false;
  }
  return true;
}

function isDigit (c)
{	return ((c >= "0") && (c <= "9"))
}

function isAllDigit (s)
{   
  var i;
  if (isEmpty(s)) 
     if (isAllDigit.arguments.length == 1) return false;
     else return (isDigital.arguments[1] == true);
  for (i = 0; i < s.length; i++)
  {   
    var c = s.charAt(i);
    if (isDigit(c)==false)
    return false;
  }
  return true;
}

function isEmpty(s)
{   
	return ((s == null) || (s.length == 0))
}

function isStateCode(s)
{
	if (s.length !=2) return false;
	s = s.toUpperCase();
	var USStateCodeDelimiter = "|";
	var USStateCodes = "AL|AK|AS|AZ|AR|CA|CO|CT|DE|DC|FM|FL|GA|GU|HI|ID|IL|IN|IA|KS|KY|LA|ME|MH|MD|MA|MI|MN|MS|MO|MT|NE|NV|NH|NJ|NM|NY|NC|ND|MP|OH|OK|OR|PW|PA|PR|RI|SC|SD|TN|TX|UT|VT|VI|VA|WA|WV|WI|WY|AE|AA|AE|AE|AP"
	if (isEmpty(s)) 
		if (isStateCode.arguments.length == 1) return false;
    else return (isStateCode.arguments[1] == true);
	return ((USStateCodes.indexOf(s) != -1) && (s.indexOf(USStateCodeDelimiter) == -1))
}

function isPhone(s){
	if ( s.indexOf("+")>=0 && s.indexOf("+")!=0 ){
		return false;
	}
	var temp1 = s.split("(")
	var temp2 = s.split(")")
	var temp3 = s.split("-")
	var temp4 = s.split(".")
	if ( temp1.length >=3 || temp2.length>=3){
		return false
	}
/*	if (temp3.length+ temp4.length >=4){
		return false
	}*/
	if ( temp1.length != temp2.length ){
		return false;
	}
	if ( s.indexOf("(")>= 0 && s.indexOf(")")>=0 && s.indexOf(")") <= s.indexOf("(") ){
		return false;
	}
	if ( s.indexOf (")") >=0 && s.indexOf("-")>=0 && s.indexOf("-") <= s.indexOf(")") )
	{
		return false;
	}
	if ( s.indexOf (")") >=0 && s.indexOf(".")>=0 && s.indexOf(".") <= s.indexOf(")") )
	{
		return false;
	}
	if(s.length>10 || s.length <7){
		return false;
	}
	for (var i=0;i < s.length;i++){
		var c= s.charAt(i);
		if (!isDigit(c) && c!="+"&& c!="("&& c!=")"&& c!="."&& c!="-"&& c!=" "){
			return false
		}
	}
	return true;
}
function isident(s){
	if ( s.indexOf("+")>=0 && s.indexOf("+")!=0 ){
		return false;
	}
	var temp1 = s.split("(")
	var temp2 = s.split(")")
	var temp3 = s.split("-")
	var temp4 = s.split(".")
	if ( temp1.length >=3 || temp2.length>=3){
		return false
	}
/*	if (temp3.length+ temp4.length >=4){
		return false
	}*/
	if ( temp1.length != temp2.length ){
		return false;
	}
	if ( s.indexOf("(")>= 0 && s.indexOf(")")>=0 && s.indexOf(")") <= s.indexOf("(") ){
		return false;
	}
	if ( s.indexOf (")") >=0 && s.indexOf("-")>=0 && s.indexOf("-") <= s.indexOf(")") )
	{
		return false;
	}
	if ( s.indexOf (")") >=0 && s.indexOf(".")>=0 && s.indexOf(".") <= s.indexOf(")") )
	{
		return false;
	}
	if(s.length>9 || s.length <9){
		return false;
	}
	for (var i=0;i < s.length;i++){
		var c= s.charAt(i);
		if (!isDigit(c) && c!="+"&& c!="("&& c!=")"&& c!="."&& c!="-"&& c!=" "){
			return false
		}
	}
	return true;
}
function checkDate(strdate,type)
  
  // TestDate(StringdateToChange,TypeOfFormat,StringOut)
  // StringdateToChange : Ngay muon kiem tra hop le
  // TypeOfFormat : Dang truyen vao cua ngay muon kiem tra hop le:
  // TypeOfFormat =1 : Truyen vao dd/mm/yyyy
  // TypeOfFormat =2 : Truyen vao mm/dd/yyyy
  // Tri tra ve cua ham 1: Ngay hop le
  //		      0: Ngay khong hop le rterretret
  {
   
	var m,d,y;

	var t=new Array(0,31,28,31,30,31,30,31,31,30,31,30,31);
	var s, pos1,pos2;
	var s = strdate;
	if (s.length==0) return 1;
	pos1=s.indexOf("/",0);
	pos2=s.indexOf("/",pos1+1);
	if ((pos1<0)||(pos2<0))
		return false;
	d=parseInt(s.substr(0,pos1),10);
	m=parseInt(s.substr(pos1+1,pos2-pos1-1),10);
	y=parseInt(s.substr(pos2+1,s.length-pos2-1),10);
	var y1=s.substr(pos2+1,s.length-pos2-1);
	if (y1.length!=4) 
	 {
	   return false;
	 }
	if (y%4==0){
		if ((y%100) ==0 && (y%400) != 0){
			t[2]=28;
		}
		//Nam nhuan
		else{
			t[2]=29;
		    }
		}
	if (type == 1) {
		if ( (t[m]<d)||(d<1) || (m<1) || (m>12)){
			return false;
		}
		}	
	if (type == 2){
		if ((t[d]<m)||(m<1) || (d<1) || (d>12)){
			return false;
		}
		}
	return true;	
   }// end Testday
function checkNumber(str){
	var a, st;
	st= str;
	for (var i=0;i< st.length; i++){
		if (st.charAt(i) < '0' || st.charAt(i)>'9'){
			if (st.charAt(i) != '.') {
				return false;
			} 
		}
	}
	return true;
}

function webdialog_(url,width_,height_){
	var cSearchValue=showModalDialog(url,0,"dialogWidth:width_;dialogHeight:height_");
	
	if (cSearchValue == -1 || cSearchValue == null)
        {
	   alert('You clicked cancel or the close box');	
	}
	else if (cSearchValue=="")
        {
	   alert('You didn\'t enter a value');
	}
	else
	{
	   alert('You want to search for ' + cSearchValue);
	}
}