//--------------------------------------------------------------------------------------------------------------------------
//              File Name: JCommonFunctions.js
//              Functions: JavaScript Common Functions Collection
//              Author: Neo Liu (2006-1-23)
//--------------------------------------------------------------------------------------------------------------------------

/*********************************************************************
    Functions: such as trim method in every language
    Author:
*********************************************************************/
function Trim(TRIM_VALUE){
    if(TRIM_VALUE.length < 1){
    return"";
    }
    TRIM_VALUE = RTrim(TRIM_VALUE);
    TRIM_VALUE = LTrim(TRIM_VALUE);
    if(TRIM_VALUE==""){
    return "";
    }
    else{
    return TRIM_VALUE;
    }
    } //End Function

    function RTrim(VALUE){
    var w_space = String.fromCharCode(32);
    var v_length = VALUE.length;
    var strTemp = "";
    if(v_length < 0){
    return"";
    }
    var iTemp = v_length -1;

    while(iTemp > -1){
    if(VALUE.charAt(iTemp) == w_space){
    }
    else{
    strTemp = VALUE.substring(0,iTemp +1);
    break;
    }
    iTemp = iTemp-1;

    } //End While
    return strTemp;

    } //End Function

    function LTrim(VALUE){
    var w_space = String.fromCharCode(32);
    if(v_length < 1){
    return"";
    }
    var v_length = VALUE.length;
    var strTemp = "";

    var iTemp = 0;

    while(iTemp < v_length){
    if(VALUE.charAt(iTemp) == w_space){
    }
    else{
    strTemp = VALUE.substring(iTemp,v_length);
    break;
    }
    iTemp = iTemp + 1;
    } //End While
    return strTemp;
} //End Function



/*********************************************************************
    Functions: date validation (mm/dd/yyyy)
    Author: Courtesy of SmartWebby.com 
            (http://www.smartwebby.com/dhtml/)
*********************************************************************/

// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function ValidateDate(oDateInput){
	var dt = oDateInput
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
    return true
}
//--------------------------------------------------------------- End of Data



var flag=false;
function DrawImage(ImgD,iwidth,iheight){

    var image=new Image();
    image.src=ImgD.src;
    if(image.width>0 && image.height>0){
    flag=true;
    if(image.width/image.height>= iwidth/iheight){
        if(image.width>iwidth){  
        ImgD.width=iwidth;
        ImgD.height=(image.height*iwidth)/image.width;
        }else{
        ImgD.width=image.width;  
        ImgD.height=image.height;
        }
        ImgD.alt=image.width+"×"+image.height;
        }
    else{
        if(image.height>iheight){  
        ImgD.height=iheight;
        ImgD.width=(image.width*iheight)/image.height;        
        }else{
        ImgD.width=image.width;  
        ImgD.height=image.height;
        }
        ImgD.alt=image.width+"×"+image.height;
        }
    }
}

function GetFilePathExtension(FilePath)
{
	if(FilePath == "")
	{
		return "";
	}
	var FullPath = FilePath;
	var Extenstion = "";
	// get the first '/' index
	var Position = FullPath.lastIndexOf(".");
	if(Position != -1)
	{
		Extenstion = FullPath.substring(Position + 1, FullPath.length)
	}
	else
	{
	    alert("Invalid file name, please specify it again.");
	}
	return Extenstion;
}