////CHECK CONTACT FORM
function CheckForm(frm){
if(frm.name.value == ''){
alert ('Please enter your name.');
frm.name.focus();
return false;
}
if(frm.email.value == ''){
alert ('Please enter your email.');
frm.email.focus();
return false;
}
if(!frm.email.value.match(/^[\w]{1}[\w\.\-_]*@[\w]{1}[\w\-_\.]*\.[\w]{2,4}$/i)){
alert ('Invalid email.');
frm.email.focus();
return false;   
}
if(frm.phone.value == ''){
alert ('Please enter your phone number.');
frm.phone.focus();
return false;
}
if(frm.question.value == ''){
alert ('Please enter your question.');
frm.question.focus();
return false;
}
}

////REFERRER
// set cookie
function setCookie (name, value, expires, path, domain, secure) {
  document.cookie = name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires : "") +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");
}
// get cookie value by name
function getCookie(name) {
	var cookie = " " + document.cookie;
	var search = " " + name + "=";
	var setStr = null;
	var offset = 0;
	var end = 0;
	if (cookie.length > 0) {
		offset = cookie.indexOf(search);
		if (offset != -1) {
			offset += search.length;
			end = cookie.indexOf(";", offset)
			if (end == -1) {
				end = cookie.length;
			}
			setStr = unescape(cookie.substring(offset, end));
		}
	}
	return(setStr);
}
// check referrer, if not exist - set current
function setReferrer(){
 cur_ref=document.referrer;
 save_ref=getCookie('ref');
 if (save_ref==null){
   setCookie('ref',cur_ref);
 }
}

//IMAGE PRELOADING
window.image_array = [];
preload_images();
function preload_images() {
	var images = [
		'menu_about_over.png',
		'menu_articles_over.png',
		'menu_portfolio_over.png',
		'menu_services_over.png',
		'contact_over.png'
	];

	for (var i in images) {
		var img = new Image();
		img.src = '/images/' + images[i];
		window.image_array.push(img);
	}
}