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_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
   var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
   if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

// 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.

// 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;
}