function IsEmptyStr(aStr) {
  return (aStr.length == 0); 
}

function IsValidUsername(aStr) {
  var alpha = /^[a-zA-Z0-9]*$/;
  return ((aStr.length >= 3) && (aStr.length <= 30) && (alpha.test(aStr)));
}

function IsValidPassword(aStr) {
  var alpha = /^[a-zA-Z0-9]*$/;
  return ((aStr.length >= 3) && (aStr.length <= 30) && (alpha.test(aStr)));
}

function IsValidName(aStr) {
  return (aStr.length > 0); 
}

function IsValidEmail(strEmail){
  validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;
  return validRegExp.test(strEmail); 
}

function IsValidPhone(aStr) {
  var num = /^[0-9]*$/;
  return ((aStr.length > 3) && (aStr.length < 30));
}

function IsValidId(aStr) {
  var num = /^[0-9]*$/;
  return (aStr.length > 0);
}

function IsValidDate(aStr) {  
  var validformat=/^\d{2}\/\d{2}\/\d{4}$/ //Basic check for format validity
  var returnval=false
  if (validformat.test(aStr)) {    
    var monthfield=aStr.split("/")[1]
    var dayfield=aStr.split("/")[0]
    var yearfield=aStr.split("/")[2]
    var dayobj = new Date(yearfield, monthfield-1, dayfield)
    if ((dayobj.getMonth()+1!=monthfield)||(dayobj.getDate()!=dayfield)||(dayobj.getFullYear()!=yearfield))
      returnval=false
    else
      returnval=true
  }
  //if (returnval==false)input.select()
  return returnval;  
}

function ValidateSendRequest() {
  var form = document.CSENDREQUEST;
  if (!IsValidEmail(form.CFROM.value)) {
    alert("Моля, въведете Email адрес!");
    form.CFROM.focus();
    return false;
  }
  
  if (IsEmptyStr(form.CTEXT.value)) {
    alert("Моля, въведете запитване!");
    form.CTEXT.focus();
    return false;
  }
 
  return true;
}

function ConfirmDelete(aStr) {
  return confirm(aStr);
}

/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var minYear=1900;
var maxYear=2007;

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 IsValidSelectDate(aYear, aMonth, aDay){
	var daysInMonth = DaysArray(12)	
	year = aYear
	month = aMonth
	day = aDay
	if (month.length<1 || month<1 || month>12){		
		return false
	}
	if (day.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){		
		return false
	}
	if (year.length != 4 || year==0 || year<minYear || year>maxYear){		
		return false
	}	
return true
}