// form validator
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 MM_validateForm() { //v4.1
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { 
    test=args[i+2]; 
    label=args[i+1];
    val=MM_findObj(args[i]);
    if (val) { 
      if (label != "") {nm=label;} else {nm=val.name;}
      if ((val=val.value)!="") {
        if (test.indexOf('isEmail')!=-1) { 
          p=val.indexOf('@');
          if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
        } else if (test!='R') { 
          num = parseFloat(val);
          if (isNaN(val)) errors+='- '+nm+' must contain a number.\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+' must contain a number between '+min+' and '+max+'.\n';
          }
        } 
      } else if (test.charAt(0) == 'R') {
        errors += '- '+nm+' is required.\n'; 
      }
    }
  }
  // validate the email list checkboxes 
  if ( (!document.theForm.elements["nlbox[1]"].checked) && 
       (!document.theForm.elements["nlbox[2]"].checked) &&
       (!document.theForm.elements["nlbox[3]"].checked) &&
       (!document.theForm.elements["nlbox[4]"].checked) &&
       (!document.theForm.elements["nlbox[5]"].checked) &&
       (!document.theForm.elements["nlbox[6]"].checked) 
      ) {
    errors += "- Please choose at least one list";
  }
  // validate (un)subscribe action selection 
  myOption = -1;
  for (i=document.theForm.funcml.length-1; i > -1; i--) {
    if (document.theForm.funcml[i].checked) {
      myOption = i;
    }
  }
  if (myOption == -1) {
    errors += "- Please choose an action for the list(s)\n"; 
  }  
  if (errors) {
    alert('The following error(s) occurred:\n'+errors);
  }
  document.MM_returnValue = (errors == '');
}