String.prototype.trim = function() {

    return this.replace(/^\s+|\s+$/, "");

}





function Validation() {

    this.str = "";

    this.IsEmpty = IsEmpty;

    this.IsStandard = IsStandard;

    this.IsText = IsText;

    this.IsNumber = IsNumber;

    this.HasLength = HasLength;

    this.IsPostalCode = IsPostalCode;

    this.IsTelephone = IsTelephone;

    this.IsEmail = IsEmail;

    this.IsStreetNumber = IsStreetNumber;

    this.IsYear = IsYear;

    this.IsAlphaNum = IsAlphaNum;

    this.IsStandardNum = IsStandardNum;

    this.IsAmount = IsAmount;

    this.IsOther = IsOther;

}





function IsEmpty() {

     if (this.str.trim() == "")

         return true;

      else

         return false;

}





function IsText() {

     if (this.str.search(/^[a-zäöüß.\s-]+$/i) != -1)

         return true;

     else

         return false;

}





function IsAlphaNum() {

     if (this.str.search(/^[a-zäöüß0-9.\s-]+$/i) != -1)

         return true;

     else

         return false;

}





function HasLength(min, max) {

     var tmpStr = this.str.trim();



     if (tmpStr.length >= min && tmpStr.length <= max)

        return true;

     else

        return false;

}



function IsNumber() {

    if (this.str.search(/^\d+$/) != -1)

       return true;

    else

       return false;

}



function IsStandard(str) {

      this.str = str;



      if (this.IsEmpty())

          return 1;



      if (!this.HasLength(2, 30))

          return 3;



      if (!this.IsText())

          return 2;



      return 0;

}





function IsStandardNum(str) {

      this.str = str;



      if (this.IsEmpty())

          return 1;



      if (!this.HasLength(2, 30))

          return 3;



      if (!this.IsAlphaNum())

          return 2;



      return 0;

}





function IsStreetNumber(str, min, max) {

    this.str = str;



    if (this.IsEmpty())

        return 1;



    if (!this.HasLength(1, 20))

        return 3;



    return 0;

}



function IsPostalCode(str, length) {

     this.str = str;



     if (this.IsEmpty())

         return 1;



     if (!this.HasLength(length, length))

          return 3;



     if (!this.IsNumber())

         return 4;



     return 0;

}





function IsTelephone(str, min, max) {

     this.str = str;



     if (this.IsEmpty())

         return 1;



     if (!this.IsNumber())

         return 4;



     if (!this.HasLength(min, max))

          return 3;



     return 0;

}



function IsEmail(str) {

     this.str = str;



     if (this.IsEmpty())

         return 1;



     if (!this.HasLength(5, 40))

          return 3;



     regexp = /^[A-Za-z0-9](([_.-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([.-]?[A-Za-z0-9]+)*)\.([A-Za-z]{2,})$/;



     if (this.str.search(regexp) == -1)

        return 2;



     return 0;

}





function IsYear(str) {

     this.str = str;



     if (this.IsEmpty())

         return 1;



     if (!this.IsNumber())

         return 4;



     if (!this.HasLength(4, 4))

          return 3;



     return 0;

}





function IsAmount(str, min) {

     this.str = str;



     if (this.IsEmpty())

         return 1;



     if (!this.IsNumber())

         return 4;



     if (!this.HasLength(4, 8))

          return 3;



     if (parseFloat(str) < min)

        return 5;



     return 0;

}





function IsOther(str, min, max, regexp) {

     this.str = str;



     if (this.IsEmpty())

         return 1;



     if (this.str.search(regexp) == -1)

        return 2;



     if (!this.HasLength(min, max))

        return 3;



     return 0;

}