browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))
	if (browser) {
            normal = new MakeArray(14)
            over = new MakeArray(14)

			normal[1].src = "images/button_vision.gif"
			normal[2].src = "images/button_gallery.gif"
			normal[3].src = "images/button_inside.gif"
			normal[4].src = "images/button_contact.gif"
			normal[5].src = "images/button_home.gif"
			normal[6].src = "images/button_artist_statement.gif"
			normal[7].src = "images/button_biography.gif"
			normal[8].src = "images/button_experience.gif"
			normal[9].src = "images/button_publications.gif"
			normal[10].src = "images/button_chad.gif"
			normal[11].src = "images/button_niel.gif"
			normal[12].src = "images/button_angela.gif"
			normal[13].src = "images/button_tasha.gif"
			normal[14].src = "images/button_chris.gif"

			over[1].src = "images/button_vision_on.gif"
			over[2].src = "images/button_gallery_on.gif"
			over[3].src = "images/button_inside_on.gif"
			over[4].src = "images/button_contact_on.gif"
			over[5].src = "images/button_home_on.gif"
			over[6].src = "images/button_artist_statement_on.gif"
			over[7].src = "images/button_biography_on.gif"
			over[8].src = "images/button_experience_on.gif"
			over[9].src = "images/button_publications_on.gif"
			over[10].src = "images/button_chad_on.gif"
			over[11].src = "images/button_niel_on.gif"
			over[12].src = "images/button_angela_on.gif"
			over[13].src = "images/button_tasha_on.gif"
			over[14].src = "images/button_chris_on.gif"
	}
	function MakeArray(n) {
        this.length = n
        for (var i = 1; i<=n; i++) {
            this[i] = new Image()
        }              
	return this	
	}
    function msover(which,num,which2,num2) {
		if (browser) {
			document.images[which].src = over[num].src
			if (num2 != null) {
				document.images[which2].src = over[num2].src
			}
		}
	}
	function msout(which,num,which2,num2) {
		if (browser) {
			document.images[which].src = normal[num].src
			if (num2 != null) {
				document.images[which2].src = normal[num2].src
			}
		}
	}
	
function isFilled(elm) {
if (elm.value !="" || elm.value == null)
	return true;
else return false;
}

function isEmail(elm) {
        if (elm.value.indexOf("@")!=-1 && elm.value.indexOf(".")!= "-1" && elm.value !="")
        return true;
        else return false;
}

function isReady(form) {
	
	if (!isFilled(form.email_address)) {
		alert ("Please enter your Email address.");
		form.email_address.focus();
		return false;
	}	
	
	if (!isEmail(form.email_address)) {
		alert ("Please enter a valid E-mail address. \nThe format is not correct.");
		form.email_address.focus();
		return false;
	}	
	
	if (!isFilled(form.first_name)) {
		alert ("Please enter your first name.");
		form.first_name.focus();
		return false;
	}		
	return true;
}

function isReadyContact(form) {
	
	if (!isFilled(form.user_email)) {
		alert ("Please enter your Email address.");
		form.user_email.focus();
		return false;
	}	
	
	if (!isEmail(form.user_email)) {
		alert ("Please enter a valid E-mail address. \nThe format is not correct.");
		form.user_email.focus();
		return false;
	}	
	
	if (!isFilled(form.message)) {
		alert ("You cannot send a blank message.");
		form.message.focus();
		return false;
	}		
	return true;
}