function toggle(elem_id){	
	var elem = document.getElementById(elem_id);	
	if (elem.className == 'hide'){
		elem.className = 'show';
	} else {
		elem.className = 'hide';
	}
}

sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

function changeImg(img,cap){	
	document.getElementById('lg_img_src').src=img;
	document.getElementById('lg_img_cap').innerHTML=cap;
}

function validEmail(){
	var x=document.forms["contact_form"]["email"].value
	var atpos=x.indexOf("@");
	var dotpos=x.lastIndexOf(".");
	if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length){
  		return false;
  	} else {
  		return true;
  	}
  }

function validateContactForm() {
	if (document.contact_form.your_name.value == ""){
		alert('Please supply your name.');
		document.contact_form.contact_name.focus();
		return false;
	} 
	
	if (document.contact_form.email.value == "" || !validEmail()){
		alert('Please supply a valid email address.');
		document.contact_form.email.select();
		return false;
	} 
	
	if (document.contact_form.msg.value == ""){
		alert('Please supply your message.');
		document.contact_form.msg.focus();
		return false;
	} 
	
	if (document.contact_form.captcha.value == ""){
		alert('Please supply the security text.');
		document.contact_form.captcha.focus();
		return false;
	}
	
	return true;
}