// Check for email address: look for [@] and [.] 
	
function isEmail(elm) {
	if (elm.value.indexOf("@") + "" != "-1" &&
		elm.value.indexOf(".") + "" != "-1" &&
		elm.value != "") 
	return true;
	else return false;
}

// Check for null and for empty

function isFilled(elm) {
	if (elm.value == "" ||
		elm.value == null) 
	return false;
	else return true;
}

function isReady(form) {

	// is address element a real email address?
	if (isEmail(form.email) == false) { 
	alert("Please enter your email address.");
	form.email.focus();
	return false;
	}

  
return true;
}

function toggle_visibility(id) {
	var e = document.getElementById(id);
	if(e.style.display == 'none') {
		e.style.display = 'block';
	}	
	else {
		e.style.display = 'none';
	}	
}

function initRollovers() {
	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');

	for (var i = 0; i < aImages.length; i++) {		
		if (aImages[i].className == 'imgover') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_o'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);
			
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;
			
			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
			}	
			
			aImages[i].onmouseout = function() {
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_o'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

window.onload = initRollovers;