// 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 5-24 chars, uppercase, lowercase, and numeral

function checkPassword (strng) {
var error = "";
if (strng == "") {
   error = "Kein Passwort eingegeben!\n";
}

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 5) || (strng.length > 24)) {
       error = "Das Passwort hat die falsche Laenge!.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "Das Passwort beinhaltet verbotene Zeichen...\n";
    } 
return error;    
}    


// username - 4-20 chars, uc, lc, and underscore only.

function checkUsername (strng) {
var error = "";
if (strng == "") {
   error = "Kein Nutzername eingegeben!\n";
}
    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if ((strng.length < 4) || (strng.length > 20)) {
       error = "Der Nutzername hat die falsche Laenge: (4-20).\n";
    }
    else if (illegalChars.test(strng)) {
    error = "Verbotene Zeichen im Nutzernamen!\n";
    } 
return error;
}       

// check URL
function checkURL (strng) {
var error = "";
if (strng == "") {
   error = "Kein Nutzername eingegeben!\n";
}
    var illegalChars = /\W\<\>\/\:\-\./; // allow letters, numbers, and underscores
    if ((strng.length < 9)) {
       error = "Die URL kann so nicht stimmen.\n";
    }
    else if (illegalChars.test(strng)) {
    error = "Verbotene Zeichen in der URL!\n";
    } 
return error;
}       

// non-empty textbox

function isEmpty(strng) {
var error = "";
  if (strng.length == 0) {
     error = "Felder, die ausgefuellt sein sollen, sind noch leer...\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;
}    

function checkWholeForm() {
    var why = "";
    why += checkEmail(upload.email.value);
    why += checkUsername(upload.login.value);
    why += isEmpty(upload.gebiet.value);
    
	if(upload.terms.checked==false)
	{
		why += "Bitte bestaetige unsere AGB!\n";
	}
    if(upload.pw1.value != upload.pw2.value)
    {
	    why += " Passwortvergleich schief gegangen! ";
    }
    if (why != "") {
       upload.action.value="ERROR";
       alert(why);
       return false;
    }
return true;
}

function checkServerForm() {
    var why = "";
	if(upload.terms.checked==false)
	{
		why += "Bitte bestaetige unsere AGB!\n";
	}
    why += checkURL(upload.url.value);
    why += isEmpty(upload.mytitle.value);
    why += isEmpty(upload.mydesc.value);
    
    if (why != "") {
       upload.action.value="ERROR";
       alert(why);
       return false;
    }
return true;
}