function emailvalidation(entered, alertbox)

{

// E-mail Validation by Henrik Petersen / NetKontoret

// Explained at www.echoecho.com/jsforms.htm

// Please do not remove this line and the two lines above.

with (entered)

{

apos=value.indexOf("@"); 

dotpos=value.lastIndexOf(".");

lastpos=value.length-1;

if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2) 

{if (alertbox) {alert(alertbox);} return false;}

else {return true;}

}

}



function valuevalidation(entered, min, max, alertbox, datatype)

{

// Value Validation by Henrik Petersen / NetKontoret

// Explained at www.echoecho.com/jsforms.htm

// Please do not remove this line and the two lines above.

with (entered)

{

checkvalue=parseFloat(value);

if (datatype)

{smalldatatype=datatype.toLowerCase();

if (smalldatatype.charAt(0)=="i") {checkvalue=parseInt(value)};

}

if ((parseFloat(min)==min && checkvalue<min) || (parseFloat(max)==max && checkvalue>max) || value!=checkvalue)

{if (alertbox!="") {alert(alertbox);} return false;}

else {return true;}

}

}





function digitvalidation(entered, min, max, alertbox, datatype)

{

// Digit Validation by Henrik Petersen / NetKontoret

// Explained at www.echoecho.com/jsforms.htm

// Please do not remove this line and the two lines above.

with (entered)

{

checkvalue=parseFloat(value);

if (datatype)

{smalldatatype=datatype.toLowerCase();

if (smalldatatype.charAt(0)=="i") 

{checkvalue=parseInt(value); if (value.indexOf(".")!=-1) {checkvalue=checkvalue+1}};

}

if ((parseFloat(min)==min && value.length<min) || (parseFloat(max)==max && value.length>max) || value!=checkvalue)

{if (alertbox!="") {alert(alertbox);} return false;}

else {return true;}

}

}





function emptyvalidation(entered, alertbox)

{

// Emptyfield Validation by Henrik Petersen / NetKontoret

// Explained at www.echoecho.com/jsforms.htm

// Please do not remove this line and the two lines above.

with (entered)

{

if (value==null || value=="")

{if (alertbox!="") {alert(alertbox);} return false;}

else {return true;}

}

}





function formvalidation(thisform)

{

// This function checks the entire form before it is submitted

// Note: This function needs to be customized to fit your form

with (thisform)

{

if (emailvalidation(your_email,"Illegal E-mail")==false) {Email.focus(); return false;};

if (valuevalidation(Value,0,5,"Value MUST be in the range 0-5")==false) {Value.focus(); return false;};

if (digitvalidation(Digits,3,4,"You MUST enter 3 or 4 integer digits","I")==false) {Digits.focus(); return false;};

if (emptyvalidation(Whatever,"The textfield is empty")==false) {Whatever.focus(); return false;};

}

}













// Copyright ? 2001 by Apple Computer, Inc., All Rights Reserved.

//

// You may incorporate this Apple sample code into your own code

// without restriction. This Apple sample code has been provided "AS IS"

// and the responsibility for its operation is yours. You may redistribute

// this code, but you are not permitted to redistribute it as

// "Apple sample code" after having made changes.





function checkWholeForm(theForm) {

    var why = "";

    why += checkEmail(theForm.your_email.value);

    why += checkPhone(theForm.phone.value);

    why += checkUsername(theForm.username.value);

    why += isEmpty(theForm.phone.value);

    why += isEmpty(theForm.realname.value);

    why += isEmpty(theForm.city.value);

    



return true;

}











// email



function checkEmail (strng) {

var error="";

if (strng == "") {

   error = "You didn't enter an email address.\n";

}



    var emailFilter=/^.+@.+\..{2,3}$/;

    if (!(emailFilter.test(strng))) { 

       error = "Please enter a valid email address.\n";

    }

    else {

//test email for illegal characters

       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/

         if (strng.match(illegalChars)) {

          error = "The email address contains illegal characters.\n";

       }

    }

return error;    

}





// phone number - strip out delimiters and check for 10 digits



function checkPhone (strng) {

var error = "";

if (strng == "") {

   error = "You didn't enter a phone number.\n";

}



var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters

    if (isNaN(parseInt(stripped))) {

       error = "The phone number contains illegal characters.";

  

    }

    if (!(stripped.length == 10)) {

	error = "The phone number is the wrong length. Make sure you included an area code.\n";

    } 

return error;

}





// password - between 6-8 chars, uppercase, lowercase, and numeral



function checkPassword (strng) {

var error = "";

if (strng == "") {

   error = "You didn't enter a password.\n";

}



    var illegalChars = /[\W_]/; // allow only letters and numbers

    

    if ((strng.length < 6) || (strng.length > 8)) {

       error = "The password is the wrong length.\n";

    }

    else if (illegalChars.test(strng)) {

      error = "The password contains illegal characters.\n";

    } 

    else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {

       error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";

    }  

return error;    

}    





// username - 4-10 chars, uc, lc, and underscore only.



function checkUsername (strng) {

var error = "";

if (strng == "") {

   error = "You didn't enter a username.\n";

}





    var illegalChars = /\W/; // allow letters, numbers, and underscores

    if ((strng.length < 4) || (strng.length > 10)) {

       error = "The username is the wrong length.\n";

    }

    else if (illegalChars.test(strng)) {

    error = "The username contains illegal characters.\n";

    } 

return error;

}       





// non-empty textbox



function isEmpty(strng) {

var error = "";

  if (strng.length == 0) {

     error = "The mandatory text area has not been filled in.\n"

  }

return error;	  

}



// was textbox altered



function isDifferent(strng) {

var error = ""; 

  if (strng != "Can\'t touch this!") {

     error = "You altered the inviolate text area.\n";

  }

return error;

}



// exactly one radio button is chosen



function checkRadio(checkvalue) {

var error = "";

   if (!(checkvalue)) {

       error = "Please check a radio button.\n";

    }

return error;

}



// valid selector from dropdown list



function checkDropdown(choice) {

var error = "";

    if (choice == 0) {

    error = "You didn't choose an option from the drop-down list.\n";

    }    

return error;

}