function trim(strMessage)
{
	var strResult;
	var charTemp;
	var i;

	strResult = "";

	//remove the left space
	for ( i = 0; i < strMessage.length; i++ ){
		charTemp = strMessage.charAt(i);
		if ( charTemp != " " ){
			strResult = strMessage.substring(i);
			break;
		}
	}

	//remove the right space
	for ( i = strResult.length-1; i >= 0; i-- ){
		charTemp = strResult.charAt(i);
		if ( charTemp != " " ){
			strResult = strResult.substring(0,i+1);
			break;
		}
	}
	return (strResult);
}


/**********************************************************************/
/* Function name            : isDate(s,f)                             */
/* Usage of this function   : To check s is a valid format            */ 
/* Input parameter required : s=input string                          */
/*                            f=input string format                   */ 
/*                            if f=1, in mm/dd/yyyy format            */
/*                            else in dd/mm/yyyy                      */
/* Return value             : if is a valid date return 1             */ 
/*                            else return 0                           */ 
/* Function required        : isPositiveInteger(), isleapyear()       */
/**********************************************************************/   
function isDate(s,f)
{
	var a1 = s.split("/");
    var a2 = s.split("-");
    var e = true;
	
    if ((a1.length!=3) && (a2.length!=3)){ 
        e=false;
    } else {
		if (a1.length==3)
			var na=a1;
		if (a2.length==3)
			var na=a2;  
		if (isPositiveInteger(na[0]) &&  isPositiveInteger(na[1]) && isPositiveInteger(na[2])){  
			if (f==1){
				var d=na[1],m=na[0];
			} else {
				var d=na[0],m=na[1];
			}  
			var y=na[2];
			if ((d>31) || (d==0))
				e=false
			if ((e) && (m>12) || (m==0))
				e=false
			if ((e) && (y<1000))
				e=false
			if (e){
				v=new Date(m+"/"+d+"/"+y);
				if (v.getMonth()!=m-1)
					e=false; 
			} 
		} else { 
			e=false;
		}       
    }   
    return e;
}

function ymd2dmy(inStr)
{
   var a1=inStr.split("/");
   var r=a1[2]+"/"+a1[1]+"/"+a1[0];
   return r;
}

function dmy2mdy(inStr)
{
   var a1=inStr.split("/");
   var r=a1[1]+"/"+a1[0]+"/"+a1[2];
   return r;
}

function isPositiveInteger(strValue)
{
	if (isInteger(strValue)){
		if (strValue.indexOf("-")==-1)
			return true;
		else
			return false;   
	} else {
		return false;  
	}
}

function isInteger(strValue) 
{
	var objRegExp  = /(^-?\d\d*$)/;
	return objRegExp.test(strValue);
}	    

function isEmail(strEmail) 
{
	var EmlAdd	= trim(strEmail.value);
	var AtSym   = EmlAdd.indexOf('@');
	var Period  = EmlAdd.lastIndexOf('.');
	var Space   = EmlAdd.indexOf(' ');
	var Length  = EmlAdd.length - 1;
	
	if ((AtSym < 1) || (Period <= AtSym+1) || (Period == Length ) || (Space != -1)){  					
		return false;
	} else if (EmlAdd == ''){
		return false;	
	} else {
		return true;
	} 
}

/*
	Check whether the input string contains English characters and punctuations only. 
	Function required: arrayFind
*/
function isEnglish(myInput)
{
	var engChars = new Array("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", 
							 "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", 
							 "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
							 " ", ".", ",", "!", "@", "#", "$", "%", "^", "&", '*', "(", ")", "_", "-", "+", "'", '"', "\\", "/", "?", "<", ">", ":", ";", "[", "]", "{", "}", "~", "`", "|" );
	
	if (myInput == ""){ // Input is empty, nothing to check
		return true;
	}
		
	for(var i=0; i<myInput.length; i++){
		if (!arrayFind(engChars, myInput.charAt(i))){
			return false;
		}
	}
	
	return true;
}

function arrayFind(myArray, myChar)
{
	var found = false;
	
	if ((myArray == "") || (myChar == "")){
		return false;
	} else {
		for(var i=0; i<myArray.length; i++){
			if(myArray[i] == myChar){
				found = true;
				break;
			}
		}
	}
	
	return found;
}

function popUpWindow(URLStr, left, top, width, height)
{
	var popUpWin=0;
  
	if (popUpWin){
		if(!popUpWin.closed) 
			popUpWin.close();
	}
	popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menub ar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}

//  Show Image in popup window
function showImg(imgURL)
{
	popup = open('/util/showimage.php?img=' + imgURL, 'showimg', 'toolbar=0,location=0,directories=no,status=0,menubar=0,scrollbars=yes,resizable=1'); 
	popup.focus();
}