function init_highlight(highlight_arr,frm,initListeners){
	for(el in highlight_arr){
		document.getElementById(highlight_arr[el]).style.borderTop = "1px solid #ccc";
		document.getElementById(highlight_arr[el]).style.borderLeft = "1px solid #ccc";
		document.getElementById(highlight_arr[el]).style.borderRight = "1px solid #bbb";
		document.getElementById(highlight_arr[el]).style.borderBottom = "1px solid #bbb";
	}
	if(initListeners){
		addListener(frm,"keyup",function(){check(frm)})
		addListener(frm,"click",function(){check(frm)})
	}
}
function highlight(id,title){
	if(o=document.getElementById(id)){
		o.style.borderTop = "1px solid #ee4";
		o.style.borderLeft = "1px solid #ee4";
		o.style.borderRight = "1px solid #dd2";
		o.style.borderBottom = "1px solid #dd2";
		o.title = title;
	}
}
function val(id){
	if(o=document.getElementById(id)){
		return o.value;
	}
	return null;
}


function getCheckedValue(radioObj) {
	//http://www.somacon.com/p143.php
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}

function addListener(obj,event_,callback){
	if(obj.addEventListener){
		obj.addEventListener(event_,callback,false);
	}else{
		obj.attachEvent("on"+event_,callback);
	}
}


//http://developer.apple.com/internet/webcontent/validation.html
//
//
//
//  /
// /
///
// email

function checkWholeForm(theForm) {
    var why = "";
    why += checkEmail(theForm.email.value);
    why += checkPhone(theForm.phone.value);
    why += checkPassword(theForm.password.value);
    why += checkUsername(theForm.username.value);
    why += isEmpty(theForm.notempty.value);
    why += isDifferent(theForm.different.value);
    for (i=0, n=theForm.radios.length; i<n; i++) {
        if (theForm.radios[i].checked) {
            var checkvalue = theForm.radios[i].value;
            break;
        } 
    }
    why += checkRadio(checkvalue);
    why += checkDropdown(theForm.choose.selectedIndex);
    if (why != "") {
       alert(why);
       return false;
    }
return true;
}

function checkEmail (strng) {
	var error="";
	if (strng.length<1 ) {
	   error = "Bitte geben Sie eine Email-Adresse an.";
	}else{
		var emailFilter=/^.+@.+\..{2,3}$/;
		if (!(emailFilter.test(strng))) { 
		   error = "Bitte geben Sie eine echte Email-Adresse an.";
		}
		else {
			//test email for illegal characters
		   var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
			 if (strng.match(illegalChars)) {
			  error = "Bitte geben Sie eine echte Email-Adresse an.";
		   }
		}
	}
	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;
}