function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		lizards_over = newImage("/images/lizards-over.gif");
		frogs_over = newImage("/images/frogs-over.gif");
		salamanders_over = newImage("/images/salamanders-over.gif");
		snakes_over = newImage("/images/snakes-over.gif");
		turtles_over = newImage("/images/turtles-over.gif");
		preloadFlag = true;
	}
}


//email validation script for email sign up below

function validEmail(email) {
			invalidChars = " /:,;"
	
			if (email == "") {
				return false
			}
			for (i=0; i<invalidChars.length; i++) {
				badChar = invalidChars.charAt(i)
				if (email.indexOf(badChar,0) > -1) {
					return false
				}
			}
			atPos = email.indexOf("@",1)
			if (atPos == -1) {
				return false
			}
			if (email.indexOf("@",atPos+1) > -1) {
				return false
			}
			periodPos = email.indexOf(".",atPos)
			if (periodPos == -1) {
				return false
			}
			if (periodPos+3 > email.length)	{
				return false
			}
			return true
		}

		function submitIt(emailForm) {
			if (!validEmail(emailForm.emailAddr.value)) {
				alert("Invalid email address")
				emailForm.emailAddr.focus()
				emailForm.emailAddr.select()
				return false
			}
	
			return true
		
		}

function toggleClamShellMenu(objectID) {
var object = document.getElementById(objectID);
if (object.style.display == 'block')
object.style.display='none';
else
object.style.display='block';
return;
}