function f_formValidate(f) {

  // build destination base
  var urlString = f.action + "?";

  // validate entries
  with(f) {    
    if (Empty(fname,"First Name is required","text",2,15)) return false;
    if (Empty(lname,"Last Name is required","text",2,20)) return false;
    if (Empty(email,"Email Address is required","text, numbers, and other characters",6,256)) return false; 
    if (!ValidEmail(email)) return false;
    if (!ValidDropDown(banner_id)) return false;
    if (Empty(vuser,"Mileage Plus number is required","numbers",11,11)) return false;
    if (!f_checkDigit(vuser)) return false; 
  }

  // disable submit button 
  if(navigator.appName.indexOf("Netscape") == -1)f_submitOnce(f); 

  // build dynamic destination 
  for (i=0; i< f.length-1; i++) {
    var g = f.elements[i];
      if (g.name.charAt(0) != "x" && g.value != null && g.value != "") { 
        if(g.name == "fname" 
           || g.name == "lname"
           || g.name == "targetURL"
           || g.name == "failureURL"
           || g.name == "email"
           || g.name == "vuser") 
        {
          urlString += g.name+ "=" + escape(g.value) + "&";
        } else if (g.type == "submit") { // do nothing here
        } else if (g.name == "banner_id") { // extract the banner id from the drop-down 
           urlString += g.name + "=" + document.coreg.banner_id.options[document.coreg.banner_id.selectedIndex].value + "&";  
        } else { // add to the string all the hidden values
           urlString += g.name +  "=" + g.value + "&";
        }
     }
  }

  // clean up URL string, remove last "&"
  urlString = urlString.substring(0,urlString.length-1);
  
  // submit window to destination
//if (confirm("Go to: " + urlString)){       //strike this line
    top.location=urlString;
  //alert(urlString);
  //} 
  return false;
}

function SelectMe(fld) {
  fld.focus();
  if (fld.type != "select-one") fld.select();
}

function Empty(fld,alertMsg,aType,minLen,maxLen) {

  // determine the Valid Characters
  var strValidChars = " ";
  if (aType.indexOf("text") != -1) {
    strValidChars += "abcdefghijklmnopqrstuvwxyz";
  } 
  if (aType.indexOf("numbers") != -1) {
    strValidChars += "1234567890";
  }
  if (aType.indexOf("other") != -1) {
    strValidChars += "@_().-/ ";
  }

  with(fld) {
    // test if we're just off really simply
    if (value.length != 0 && value != " ") { 
      // here, there's some characters and it's not a single space
      //let's test further...assuming all things start off good:
      var valid = true;
      // let's test for length first - there's special cases
      // ...for exact length (i.e. the ARC Number),
      if (minLen == maxLen && value.length != minLen) {
        valid = false;
        alertMsg +=". It should be a " + minLen + " digit number";
      }
      // ...for too short,
      if (value.length < minLen && valid == true) {
        valid = false;
        alertMsg +=". It should be at least " + minLen + " characters long";
      }
      // ...and too long.
      if (value.length > maxLen && valid == true) {
        valid = false;
        alertMsg +=". It should be at no more than " + maxLen + " characters long";
      }      
      // Now, set up a flag for looping
      var spaces = 0;      
      // now loop thru the string given and see what's there
      for(i=0; i < value.length && valid == true; i++) {
        aChar = value.charAt(i).toLowerCase();
        if (strValidChars.indexOf(aChar) == -1) {
          valid=false;
          alertMsg += ", and should contain only " + aType;
        }
        if (aChar == " ") {
          spaces++;
          if(spaces == value.length) {
              valid=false;
              alertMsg += ", and cannot consist of all spaces"
          } else {
           // Special case, text only fields can not have more than 2 spaces
            if (type == "text") {
              if(spaces > 5) {
                valid=false;
                alertMsg += ", and cannot contain extra spaces"
              }
            }
          }
        }  
      }      
      // we're done looping - are things good or not?
      if(!valid) {
        alert(alertMsg + ".");
        setTimeout("SelectMe(document.forms['" + 
  		    fld.form.name + "'].elements['" + fld.name + "'])", 0);
  	    return true;
      } else { 
        return false;
      }
  	} else { // we made a simple stupid error - give me basic messaging
      alert(alertMsg + ".");
      setTimeout("SelectMe(document.forms['" + 
  		  fld.form.name + "'].elements['" + fld.name + "'])", 0);
  	  return true;
    } 
  } 
}

function ValidEmail(address) {
  with (address)  {
    apos=value.indexOf("@"); 
    dotpos=value.lastIndexOf(".");
    lastpos=value.length-1;

    if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2) {
      alert('Email address requires the @ symbol, a . (dot), and at least two letters after the dot.');
      setTimeout("SelectMe(document.forms['" + 
  		address.form.name + "'].elements['" + address.name + "'])", 0);
      return false;
    } else return true;
  } 
}

function ValidDropDown(dropdown) {
  with (dropdown)  {
    if (selectedIndex < 1) {
      alert('Please tell us how you heard about this promotion.');
      //setTimeout("SelectMe(document.forms['" + 
  		//dropdown.form.name + "'].elements['" + dropdown.name + "'])", 0);
      return false;
    } else return true;
  } 
}

function ValidTerms(fld,alertMsg) {
  with(fld) {
    if (checked == false) {
      alert(alertMsg);
      setTimeout("SelectMe(document.forms['" + 
  		fld.form.name + "'].elements['" + fld.name + "'])", 0);    
      return false;
    } else return true;
  } 
}

function f_checkDigit(fld) {
  var mpNum = fld.value;
    if (mpNum.search(/^\d{11}$/) == -1) return false;
    var factor = [5,4,3,2,7,6,5,4,3,2];
    var check = 0;
    for (var digit = 0; digit < 10; digit++)
        check += mpNum.charAt(digit) * factor[digit];
    check = (((11 - (check % 11)) % 11) % 10);
    // return (check == mpNum.charAt(10));
    
    if(check == mpNum.charAt(10)) {
      return true;
    } else {
      alert("The Mileage Plus number you entered is invalid, please try again.");
      setTimeout("SelectMe(document.forms['" + 
  		  fld.form.name + "'].elements['" + fld.name + "'])", 0);
      return false;
    }
}


function f_submitOnce(aForm){
  // Controls Button Change //
  if (document.all||document.getElementById){
    for (i=0; i < aForm.length; i++){
      var t_obj=aForm.elements[i];
      if(t_obj.type.toLowerCase()=="submit"){
        t_obj.value="Sending...";
        t_obj.disabled=true;  
      }
    }
  }
}