// -----------------------------------------------------------------------------
// Generic Form Validation
//
// -----------------------------------------------------------------------------
// Initializing script  - setting global variables
// -----------------------------------------------------------------------------
var checkObjects		= new Array(); 	// Array containing the objects to validate.
var errors				= ""; 			// Variable holding the error message.
var returnVal			= false; 		// General return value. The validated form will only be submitted if true.
var language			= new Array(); 	// Language independent error messages!
var selectecLanguage	= "english";	// Choose between "english", "danish", "dutch", "french", "spanish", "russian", "portuguese"
language.english		= new Array();
language.danish			= new Array();
language.dutch			= new Array();
language.french			= new Array();
language.spanish		= new Array();
language.russian		= new Array();
language.portuguese		= new Array();
language.swedish		= new Array();
language.polish			= new Array();
language.brazport		= new Array(); // Brazilian Portuguese

// Error messages in english:
	language.english.header		= "The following error(s) occured:"
	language.english.start		= "->";
	language.english.field		= " Field ";
	language.english.require	= " is required";
	language.english.min		= " and must consist of at least ";
	language.english.max		= " and must not contain more than ";
	language.english.minmax		= " and no more than ";
	language.english.chars		= " characters";
	language.english.num		= " and must contain a number";
	language.english.email		= " must contain a valid e-mail address";
	language.english.fileName	= " must not contain (+,', ,=)";
	language.english.dates		= " is not a valide date.";

// Error messages in Spanish: Thanks to Edu <edu@macneto.com>
	language.spanish.header		= "Se ha producido un error:"
	language.spanish.start		= "->";
	language.spanish.field		= " El campo ";
	language.spanish.require	= " es obligatorio";
	language.spanish.min		= " y debe contener al menos ";
	language.spanish.max		= " y no debe contener m\341s de ";
	language.spanish.minmax		= " y no m\341s de ";
	language.spanish.chars		= " caracteres";
	language.spanish.num		= " y debe contener un n\372mero";
	language.spanish.email		= " debe contener una direcci\363n de e-mail v\341lida";
	

// -----------------------------------------------------------------------------
// define - Call this function in the beginning of the page. I.e. onLoad.
//
// n = name of the input field (Required)
// type= string, num, email (Required)
// min = the value must have at least [min] characters (Optional)
// max = the value must have maximum [max] characters (Optional)
// d = (Optional)
// -----------------------------------------------------------------------------
function define(n,type,HTMLname,min,max,d){
	var p;
	var i;
	var x;
	if(!d) d=document;
	if((p=n.indexOf("?"))>0&&parent.frames.length){
    	d=parent.frames[n.substring(p+1)].document;
    	n=n.substring(0,p);
    }
	if(!(x=d[n])&&d.all) x=d.all[n];
	
  	for (i=0;!x&&i<d.forms.length;i++){
  		x=d.forms[i][n];
  	}
	for(i=0;!x&&d.layers&&i<d.layers.length;i++){
		x=define(n,type,HTMLname,min,max,d.layers[i].document);
		return x;		
	}
	
	// Create Object. The name will be "V_something" where something is the "n" parameter above.
	eval("V_"+n+" = new formResult(x,type,HTMLname,min,max);");
	checkObjects[eval(checkObjects.length)] = eval("V_"+n);
}

// -----------------------------------------------------------------------------
// formResult - Used internally to create the objects
// -----------------------------------------------------------------------------
function formResult(form,type,HTMLname,min,max){
	this.form = form;
	this.type = type;
	this.HTMLname = HTMLname;
	this.min  = min;
	this.max  = max;
}

// -----------------------------------------------------------------------------
// validate - Call this function onSubmit and return the "returnVal". (onSubmit="validate();return returnVal;")
// -----------------------------------------------------------------------------
function validate(){
	if(checkObjects.length>0){
		errorObject = "";
	
		for(i=0;i<checkObjects.length;i++){
			validateObject 			= new Object();
			validateObject.form 	= checkObjects[i].form;
			validateObject.HTMLname = checkObjects[i].HTMLname;
			validateObject.val 		= checkObjects[i].form.value;
			validateObject.len 		= checkObjects[i].form.value.length;
			validateObject.min 		= checkObjects[i].min;
			validateObject.max 		= checkObjects[i].max;
			validateObject.type 	= checkObjects[i].type;
			
			//Debug alert line
			//alert("validateObject: "+validateObject+"\nvalidateObject.val: 
			//		"+validateObject.val+"\nvalidateObject.len: 
			//		"+validateObject.len+"\nvalidateObject.min,validateObject.max: 
			//		"+validateObject.min+","+validateObject.max+"\nvalidateObject.type: "+validateObject.type);
			
			// Checking input. If "min" and/or "max" is defined the input has to be within the specific range
			if(validateObject.type == "num" || validateObject.type == "string")
			{
				if((validateObject.type == "num" && validateObject.len <= 0) || 
				   (validateObject.type == "num" && isNaN(validateObject.val)))
							{errors+=language[selectecLanguage].start+
							 language[selectecLanguage].field+
							 validateObject.HTMLname+
							 language[selectecLanguage].require+
							 language[selectecLanguage].num+"\n";} 
				else if (validateObject.min && validateObject.max && (validateObject.len < 
						 validateObject.min || validateObject.len > validateObject.max))
							{errors+=language[selectecLanguage].start+
							 language[selectecLanguage].field+
							 validateObject.HTMLname+
							 language[selectecLanguage].require+
							 language[selectecLanguage].min+
							 validateObject.min+
							 language[selectecLanguage].minmax+
							 validateObject.max+
							 language[selectecLanguage].chars+"\n";} 
				else if (validateObject.min && !validateObject.max && (validateObject.len < validateObject.min))
							{errors+=language[selectecLanguage].start+
							 language[selectecLanguage].field+
							 validateObject.HTMLname+
							 language[selectecLanguage].require+
							 language[selectecLanguage].min+
							 validateObject.min+
							 language[selectecLanguage].chars+"\n";} 
				else if (validateObject.max && !validateObject.min &&(validateObject.len > validateObject.max))
							{errors+=language[selectecLanguage].start+
							 language[selectecLanguage].field+
							 validateObject.HTMLname+
							 language[selectecLanguage].require+
							 language[selectecLanguage].max+
							 validateObject.max+
							 language[selectecLanguage].chars+"\n";} 
				else if (!validateObject.min && !validateObject.max && validateObject.len <= 0)
							{errors+=language[selectecLanguage].start+
							 language[selectecLanguage].field+
							 validateObject.HTMLname+
							 language[selectecLanguage].require+"\n";}
			} 
			else if(validateObject.type == "email")
			{
				// Checking existense of "@" and ".". The length of the input must be at least 5 characters. 
				//The "." must neither be preceding the "@" nor follow it.
				if((validateObject.val.indexOf("@") == -1) || (validateObject.val.charAt(0) == ".") || 
				   (validateObject.val.charAt(0) == "@") ||(validateObject.len < 6) || 
				   (validateObject.val.indexOf(".") == -1) || 
				   (validateObject.val.charAt(validateObject.val.indexOf("@")+1) == ".") || 
				   (validateObject.val.charAt(validateObject.val.indexOf("@")-1) == "."))
							{errors+=language[selectecLanguage].start+
							 language[selectecLanguage].field+
							 validateObject.HTMLname+
							 language[selectecLanguage].email+"\n";}
			}
			else if(validateObject.type == "fileName")
			{
				var file;
				file = validateObject.val
				while (file.indexOf("\\") != -1)
					file = file.slice(file.indexOf("\\") + 1);
				//characters not accepted
				if((validateObject.val.indexOf("'") != -1) || (file.indexOf(" ") != -1) || 
				   (validateObject.val.indexOf("+") != -1) || (validateObject.val.indexOf("=") != -1))
							{errors+=language[selectecLanguage].start+
							 language[selectecLanguage].field+
							 validateObject.HTMLname+
							 language[selectecLanguage].fileName+"\n";}
			}
			else if(validateObject.type == "dates")
			{
				//check valid date format
				var a, len;
				a = validateObject.val.split("-");
				len = a.length;
				if((len != 3) || !isDate(a[0], a[1], a[2]))
							{errors+=language[selectecLanguage].start+
							 language[selectecLanguage].field+
							 validateObject.HTMLname+
							 language[selectecLanguage].dates+"\n";}
			}
		}
	}
	// Used to set the state of the returnVal. If errors -> show error messages in chosen language
	if(errors){
		alert(language[selectecLanguage].header.concat("\n"+errors));
		errors = "";
		returnVal = false;
	} else {
		returnVal = true;
	}
}

//********* validate date ***************
function getYear(d) { 
  return (d < 1000) ? d + 1900 : d;
  }

function isDate (year, month, day) {
  // month argument must be in the range 1 - 12
  
  month = month - 1;  // javascript month range : 0 - 11
  //alert(month);
  var tempDate = new Date(year,month,day);
  //alert (tempDate);
  if ((getYear(tempDate.getYear()) == year) &&
     (month == tempDate.getMonth()) &&
     (day == tempDate.getDate()) )
      return true;
  else
     return false
  }
//********* validate date ***************