/**
* @version 1.0 commoncheck.js
*
* @copyright Copyright (C) 2007 by  4e Web Development Group. All rights reserved.  
* @author Tong Dinh Thuong - dinhthuong02@yahoo.com
*/

function isURL(argvalue) {

  if (argvalue.indexOf(" ") != -1)
    return false;
  else if (argvalue.indexOf("http://") == -1)
    return false;
  else if (argvalue == "http://")
    return false;
  else if (argvalue.indexOf("http://") > 0)
    return false;

  argvalue = argvalue.substring(7, argvalue.length);
  if (argvalue.indexOf(".") == -1)
    return false;
  else if (argvalue.indexOf(".") == 0)
    return false;
  else if (argvalue.charAt(argvalue.length - 1) == ".")
    return false;

  if (argvalue.indexOf("/") != -1) {
    argvalue = argvalue.substring(0, argvalue.indexOf("/"));
    if (argvalue.charAt(argvalue.length - 1) == ".")
      return false;
  }

  if (argvalue.indexOf(":") != -1) {
    if (argvalue.indexOf(":") == (argvalue.length - 1))
      return false;
    else if (argvalue.charAt(argvalue.indexOf(":") + 1) == ".")
      return false;
    argvalue = argvalue.substring(0, argvalue.indexOf(":"));
    if (argvalue.charAt(argvalue.length - 1) == ".")
      return false;
  }

  return true;

}
function trim(str){    
    var i, j
    for (i = 0; i < str.length; i++)
        if (str.charAt(i) != ' ') break;
    for (j = str.length - 1; j >= 0; j--)
        if (str.charAt(j) != ' ') break;
    return str.substr(i, j - i + 1)
}

function isNumeric(str){	
    var iLen;
    iLen=str.length;
    var c ;
    for(var i=0; i<iLen; i++)
    {    c = str.charAt(i);
        if ((c<'0') || (c>'9'))
            return false;
    }
    return true;
}

function isFloat(str){
    var f = str.indexOf('.')
    var l = str.lastIndexOf('.')
    if (f != l)
        return false
    var iLen;
    iLen=str.length;
    var c ;
    for(var i = 0; i<iLen; i++)
    {    c = str.charAt(i);
        if (((c < '0') || (c > '9')) && (c != '.'))
            return false;
    }
    return true;
}

function isNull(str){
    if(str==null)
        return true;
    var iLen = str.length;
    for (var i = 0; i < iLen; i++)
        if (str.charAt(i)!= ' ')
            return false;
    return true;
}

function Trim(str){
    while((str.length > 0) && (str.charAt(0) == ' '))
            str = str.substring(1,str.length);
    while((str.length > 0) && (str.charAt(str.length-1) == ' '))
            str = str.substring(0,str.length-1);
    return str;
}

function NumberValid(thefield){
    var NumStr = Trim(thefield.value)
    if (isNull(NumStr))
        return false
    if (isNaN(parseInt(NumStr)))
        return false
    return true
}

function FloatValid(thefield){
    var NumStr = Trim(thefield.value)
    if (isNull(NumStr))
        return false
    if (isNaN(parseFloat(NumStr)))
        return false
    return true
}

function dateValid(thefield){
    var dateStr = Trim(thefield.value);
    if (isNull(dateStr))
        return true;
    var i1 = dateStr.indexOf("-");
    var j1 = dateStr.indexOf("-", i1 + 1);
    if ((i1 == -1) || (j1 == -1))
        return false;
    var year = parseInt(dateStr.substr(0, i1), 10);
    var month = parseInt(dateStr.substr(i1 + 1, j1 - i1 - 1), 10);
    var day = parseInt(dateStr.substr(j1 + 1), 10);    
    if ((month < 1) || (month > 12))
        return false;
    if (isNaN(day) || isNaN(month) || isNaN(year) || (year < 0))
        return false;
    if (year < 30)
        year += 2000;
    else if (year < 100)
        year += 1900;
    var DOM = 31;
    switch(month)
    {
        case 2:
            DOM = ((((year % 4) == 0) && ((year % 100) != 0)) || ((year % 400) == 0)) ? 29 : 28;
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            DOM = 30;break;
        default:
            DOM = 31;
    }
    if ((day < 1) || (day > DOM))
        return false;
    
    return true;
}

function timeValid(thefield){
    var timeStr = Trim(thefield.value);

    if (isNull(timeStr)) return true

    var i1 = timeStr.indexOf(":")
    if (i1 == -1)
    {    timeStr += ":0"
        i1 = timeStr.indexOf(":")
    }
    var j1 = timeStr.indexOf(":", i1 + 1)

    var hour = parseInt(timeStr.substr(0, i1), 10)

    if(j1==-1)
        var minute = parseInt(timeStr.substr(i1+1), 10)
    else
        var minute = parseInt(timeStr.substr(i1+1, j1 - i1 - 1), 10)

    if (isNaN(hour) || isNaN(minute)) return false;

    if(hour < 0 || hour > 24) return false;
    if(minute < 0 || minute >59) return false;

    thefield.value = ((hour < 10) ? ("0" + hour) : hour) + ":" + ((minute<10) ? "0" + minute : minute);

    return true
}

function emailValid(str){
    if(isNull(str))
        return true;
    var chrs = "~`!#$%^&*()+=|\{}[]':;<>\",/?";
    for(var i = 0; i < chrs.length; i++)
        if(str.indexOf(chrs.charAt(i)) < 0)
            continue;
        else
            return false;
    var i = str.indexOf("@"), j = str.indexOf("."), k = str.indexOf("@", i + 1)
    if ((i == -1) || (j == -1) || (str.charAt(str.length-1) == '.') || (k >= 0))
        return false;
    return true;
}

function ImageFileValid(str) {
    validImageFile = /(.jpg|.JPG|.gif|.GIF)$/;
    if (str == "") return true;
    if (validImageFile.test(str)) return true;
    return false;
} 

function toggleTab() {
    var args = arguments;
    var obj;
    for (var i=0;i<args.length; i+=2) {
	    obj = eval("document.all."+args[i]);
	    if (obj)
		    obj.style.display = (args[i+1]=="open"?"":"none");
    }
}

// JS Calendar
var calendar = null; // remember the calendar object so that we reuse
// it and avoid creating another

// This function gets called when an end-user clicks on some date
function selected(cal, date) {
	cal.sel.value = date; // just update the value of the input field
}

// And this gets called when the end-user clicks on the _selected_ date,
// or clicks the "Close" (X) button.  It just hides the calendar without
// destroying it.
function closeHandler(cal) {
	cal.hide();			// hide the calendar

	// don't check mousedown on document anymore (used to be able to hide the
	// calendar when someone clicks outside it, see the showCalendar function).
	Calendar.removeEvent(document, "mousedown", checkCalendar);
}

// This gets called when the user presses a mouse button anywhere in the
// document, if the calendar is shown.  If the click was outside the open
// calendar this function closes it.
function checkCalendar(ev) {
	var el = Calendar.is_ie ? Calendar.getElement(ev) : Calendar.getTargetElement(ev);
	for (; el != null; el = el.parentNode)
	// FIXME: allow end-user to click some link without closing the
	// calendar.  Good to see real-time stylesheet change :)
	if (el == calendar.element || el.tagName == "A") break;
	if (el == null) {
		// calls closeHandler which should hide the calendar.
		calendar.callCloseHandler(); Calendar.stopEvent(ev);
	}
}

// This function shows the calendar under the element having the given id.
// It takes care of catching "mousedown" signals on document and hiding the
// calendar if the click was outside.
function showCalendar(id) {

	var el = document.getElementById(id);
	    
	if (calendar != null) {
		// we already have one created, so just update it.
		calendar.hide();		// hide the existing calendar
		calendar.parseDate(el.value); // set it to a new date
	} else {
		// first-time call, create the calendar        
		var cal = new Calendar(true, null, selected, closeHandler);
        
		calendar = cal;		// remember the calendar in the global
		cal.setRange(1900, 2070);	// min/max year allowed
		calendar.create();		// create a popup calendar
	}
	calendar.sel = el;		// inform it about the input field in use
	calendar.showAtElement(el);	// show the calendar next to the input field

	// catch mousedown on the document
	Calendar.addEvent(document, "mousedown", checkCalendar);
	return false;  
}