/*
 * DHTML date validation script for dd/mm/yyyy. 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 strDay=dtStr.substring(0,pos1)
	var strMonth=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 : dd/mm/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;
}

// Removes leading whitespaces
function LTrim(value) 
{
   var re = /\s*((\S+\s*)*)/;
   return value.replace(re, "$1");
}

// Removes ending whitespaces
function RTrim(value) 
{
	var re = /((\s*\S+)*)\s*/;
	return value.replace(re, "$1");
}

// Removes leading and ending whitespaces
function trim(value) 
{
	return LTrim(RTrim(value));
}

//E-Mail Validation				
function echeck(str) 
{
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)

	if (str.indexOf(at)==-1){return false}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
	{return false}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
	{return false}

	 if (str.indexOf(at,(lat+1))!=-1){return false}

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
	 {return false}

	 if (str.indexOf(dot,(lat+2))==-1){return false}
	
	 if (str.indexOf(" ")!=-1){return false}

	 return true					
}	

// Validate Character only

function charonly(e)
{
	var unicode=e.charCode? e.charCode : e.keyCode;
	
	if(unicode == 37 || unicode == 95 || unicode == 39 || unicode == 45 )
	{
		return false;
	}
	
	if (unicode!=8)
	{
			if ((unicode!=32 && (unicode<65 || (unicode>90 && (unicode<97 || unicode>122)))) && unicode!=39 && unicode!=45 && unicode!=13 && unicode!=15 && unicode!=37 &&  unicode!=39 && unicode!=14 && unicode!=9  )
			return false
	}
}

// Validate Numbers only

function numberOnly(e)
{
	var unicode=e.charCode? e.charCode : e.keyCode;
	
	if(unicode >= 48 && unicode <= 57)
	{
		return true;
	}
	
	return false;
}
 
// Validate Max Character

function validateMaxGlobal(maxlength,objName) 
{
      //var maxlength=5;
      if(objName.value.length >= maxlength)
      {
            //alert('Your comments must be 50 characters or less');
            objName.focus();
            return false;
      } 
      else 
      {
            return true;
      }
}