// Form validation, derived from Apple example code.

// 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;
}

// End form validation functions.

function OpenPopupWindow(aURL,aWidth,aHeight) {

	// mozilla & safari DOM
	theParentTop 		= parent.screenY;
	theParentLeft 		= parent.screenX;
	theParentHeight 	= parent.innerHeight;
	theParentWidth 		= parent.innerWidth;
	
	// winIE DOM
	 if (navigator.appName.indexOf("Microsoft")!=-1) {
		theParentTop 		= parent.screenTop - 60; // cheat the top a bit
		theParentLeft 		= parent.screenLeft;
		theParentHeight 	= document.body.offsetHeight;
		theParentWidth 		= document.body.offsetWidth;
	}
	
	// common code
	theTop 		= Math.round((theParentHeight / 2) - (aHeight / 2) + theParentTop);
	theLeft		= Math.round((theParentWidth  / 2) - (aWidth  / 2) + theParentLeft);
	
	theWindow = window.open(aURL, 'progressWindow', 'width=' + aWidth + ',height=' + aHeight + ',top=' + theTop + ',left=' + theLeft + ',scrollbars=yes,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=yes');
}

// Show or Hide a dropdown Menu (a collection of list items)

function ToggleVisibility(anID) {
	
	var theItem	= document.getElementById(anID);
	
	if (theItem) {
		if (theItem.style.display == "block") {
			theItem.style.display = "none";
		} else {
			theItem.style.display = "block";
		}
	}
}

function ToggleMenu(anID) {
	var theItem = document.getElementById(anID);
	
	for (var i = 1; i<=10; i++) {
		if (document.getElementById('sub_menu'+i)) {
			document.getElementById('sub_menu'+i).style.display='none';
		}
	}
	
	if (theItem) {
		theItem.style.display='block';
	}
}

// Show or Hide an object

function ShowAnObject(elt) {
	elt.style.display = "block";
}

function HideAnObject(elt) {
	elt.style.display = "none";
}

// Swap an Image (used for star and balloon mouseovers)

function SwapImage(anID,aSrc) {
	if (aSrc) {
		if (aSrc.src) {
			theStarIMG 			= document.getElementById(anID);
			if (theStarIMG) {
				theStarIMG.src	= aSrc.src;
			}
		}
	}
	return true;
}