// Generic Form Validation
var checkObjects  = new Array();
var errors     = "";
var returnVal     = false;
var language      = new Array();
language["header"]   = "The following fields need to be completed:"
language["start"] = "->";
language["field"] = " ";
language["require"]  = " is required";
language["min"]      = " and must consist of at least ";
language["max"]      = " and must not contain more than ";
language["minmax"]   = " and no more than ";
language["chars"] = " characters";
language["num"]      = " and must contain a number";
language["email"] = " must contain a valid e-mail address";
// -----------------------------------------------------------------------------
// define - Call this function in the beginning of the page. I.e. onLoad.
// n = name of the input field (Required)
// type= string, num, email, radio (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;
   var name = n;
   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(name, n, type, HTMLname, min, max, d.layers[i].document);
      return (x);
   }
   eval("V_"+n+" = new formResult(name, x, type, HTMLname, min, max);");
   checkObjects[eval(checkObjects.length)] = eval("V_"+n);
}
function formResult(name, form, type, HTMLname, min, max) {
   this.name = name;
   this.form = form;
   this.type = type;
   this.HTMLname = HTMLname;
   this.min  = min;
   this.max  = max;
}
function validate() {
   if ( checkObjects.length > 0 ) {
      errorObject = "";
      for ( i = 0; i < checkObjects.length; i++ ) {
         validateObject = new Object();
         validateObject.name = checkObjects[i].name;
         validateObject.form = checkObjects[i].form;
         validateObject.HTMLname = checkObjects[i].HTMLname;
         validateObject.val = checkObjects[i].form.value;
         validateObject.min = checkObjects[i].min;
         validateObject.max = checkObjects[i].max;
         validateObject.type = checkObjects[i].type;
         if ( validateObject.type == "num" || validateObject.type == "string" ) {
            validateObject.len = checkObjects[i].form.value.length;
            if ( (validateObject.type == "num" && validateObject.len <= 0) || (validateObject.type == "num" && isNaN(validateObject.val)) ) {
               errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['num'] + "\n";
            }
            else if ( validateObject.min && validateObject.max && (validateObject.len < validateObject.min || validateObject.len > validateObject.max) ) {
               errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['min'] + validateObject.min + language['minmax'] + validateObject.max+language['chars'] + "\n";
            }
            else if ( validateObject.min && !validateObject.max && (validateObject.len < validateObject.min) ) {
               errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['min'] + validateObject.min + language['chars'] + "\n";
            }
            else if ( validateObject.max && !validateObject.min &&(validateObject.len > validateObject.max) ) {
               errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['max'] + validateObject.max + language['chars'] + "\n";
            }
            else if ( !validateObject.min && !validateObject.max && validateObject.len <= 0 ) {
               errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + "\n";
            }
         }
         else if ( validateObject.type == "email" ) {
// Checking existense of "@" and ".".
// Length of must >= 5 and the "." must
// not directly precede or follow the "@"
            if ( (validateObject.val.indexOf("@") == -1) || (validateObject.val.charAt(0) == ".") || (validateObject.val.charAt(0) == "@") || (validateObject.val.indexOf(".") == -1) || (validateObject.val.charAt(validateObject.val.indexOf("@")+1) == ".") || (validateObject.val.charAt(validateObject.val.indexOf("@")-1) == ".") ) {
               errors += language['start'] + language['field'] + validateObject.HTMLname + language['email'] + "\n";
            }
         }
         else if ( validateObject.type == "radio" ) {
            var el = document.forms[0].elements;
            for ( var z = 0 ; z < el.length ; ++z ) {
               if (el[z].name == validateObject.name) {
                  var radiogroup = el[el[z].name]; // get the whole set of radio buttons.
                  var itemchecked = false;
                  for ( var j = 0 ; j < radiogroup.length ; ++j ) {
                     if ( radiogroup[j].checked ) {
                        itemchecked = true;
                        break;
                     }
                  }
                  if ( !itemchecked ) {
                     errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + "\n";
                     break;
                  }
               }
            }
         }
      }
   }
   if ( errors ) {
      alert(language["header"].concat("\n" + errors));
      errors = "";
      returnVal = false;
   }
   else {
      returnVal = true;
   }
}