if (document.layers){
	pre = 'document.';
	post = '';
}else if (document.getElementById){
	pre = 'document.getElementById("';
	post ='").style';
}else if (document.all){
	pre = 'document.all.';
	post = '.style';
}

var mnuSelected = '';
function showMenu(menu){
	hideMenu(mnuSelected)
	var subLayer = eval(pre + menu + post);
	subLayer.visibility = 'visible';
    mnuSelected = menu;
}

function hideMenu(menu){
	if(mnuSelected!=''){
		var subLayer = eval(pre + menu + post);
   		subLayer.visibility = 'hidden';
	}
}
function validateForm(form){
	for (var i=0; i < form.elements.length; i++){
		if (form.elements[i].value == ""){
			alert('Please complete ALL the fields.')
			return false
		}
	}
	return true
}
///////////////        ROLLOVER IMAGES         ////////////////////////////////////
var onImgArray = new Array()
onImgArray["about"] = new Image(71,23);
onImgArray["about"].src = 'nav_images/about_usOver.gif';
onImgArray["what"] = new Image(106,23);
onImgArray["what"].src = 'nav_images/believeOver.gif';
onImgArray["mission"] = new Image(111,23);
onImgArray["mission"].src = 'nav_images/missionOver.gif';
onImgArray["use"] = new Image(84,23);
onImgArray["use"].src = 'nav_images/useful_linksOver.gif';
onImgArray["contact"] = new Image(84,23);
onImgArray["contact"].src = 'nav_images/contactOver.gif';
onImgArray["mail"] = new Image(84,23);
onImgArray["mail"].src = 'nav_images/mailingOver.gif';


var offImgArray = new Array()
offImgArray["about"] = new Image(71,23);
offImgArray["about"].src = 'nav_images/about_us.gif';
offImgArray["what"] = new Image(106,23);
offImgArray["what"].src = 'nav_images/believe.gif';
offImgArray["mission"] = new Image(111,23);
offImgArray["mission"].src = 'nav_images/mission.gif';
offImgArray["use"] = new Image(84,23);
offImgArray["use"].src = 'nav_images/useful_links.gif';
offImgArray["contact"] = new Image(84,23);
offImgArray["contact"].src = 'nav_images/contact.gif';
offImgArray["mail"] = new Image(84,23);
offImgArray["mail"].src = 'nav_images/mailing.gif';

function imgOn(img){
	if(document.images){
	document.images[img].src = onImgArray[img].src
	var subLayer = eval(pre + img + post);
	subLayer.zIndex = 4;
	}
}
function imgOff(img){
	if(document.images){
	var subLayer = eval(pre + img + post);
	subLayer.zIndex = 3;
	document.images[img].src = offImgArray[img].src
	}
}