// FvdS 2007-12
// form validation procedure MSweb_validateForm
// for each field: a set of 4 parameters
// - id of the field to be checked
// - logical, 'external' field name
// - what's to be checked
// - only for antispam questions: required value

// FvdS 2008-02
// enhanced antispam function: more  possible answers

function MM_findObj(n, d) { //v4.01
  var p,i,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=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MSweb_validateForm() {
  var i,p,q,nm,test,
  num,min,max,
  errors='',
  args=MSweb_validateForm.arguments;

for (i=0; i<(args.length-3); i+=4)
    {
      test=args[i+2];
      val=MM_findObj(args[i]);
      if (val)
        {
          nm=val.name;
          if ((val=val.value)!="")
            {
              if (test.indexOf('isEmail')!=-1)
                {

//document.write('<p>isEmail');

                  p=val.indexOf('@');
                  if (p<1 || p==(val.length-1))
                    errors+='- ' + args[i+1] + ': voer een geldig e-mail-adres in.\n';
                }
              else if (test.indexOf('isFixed')!=-1)
                {

//document.write('<p>isFixed');

// possible values are separated by '|'. First and last '|' are NOT optional

                  if (val.toLowerCase()!=args[i+3].toLowerCase())
                  {
                    if
                     (args[i+3].indexOf('|'+val.toLowerCase()+'|')==-1)
                     errors+='- ' + args[i+1] + ': de waarde is niet correct.\n';
                  }
                }
              else if (test!='R')
                {
                  num = parseFloat(val);
                  if (isNaN(val))
                    errors+='- '+nm+': vul een getal in.\n';
                  if (test.indexOf('inRange') != -1)
                    {
                      p=test.indexOf(':');
                      min=test.substring(8,p);
                      max=test.substring(p+1);
                      if (num<min || max<num)
                        errors+='- '+nm+': vul een getal tussen '+min+' en '+max+' in.\n';
                    }
                }
            }
          else if (test.charAt(0) == 'R')
            errors += '- '+args[i+1] +': moet ingevuld worden.\n';
        }
    }
  if (errors) alert('Niet alle velden zijn correct ingevuld:\n'+errors);
  document.MM_returnValue = (errors == '');
}