// copied from http://www.dustindiaz.com/getelementsbyclass/
function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\\\s)"+searchClass+"(\\\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function setVisibility(element, flag) {
  element.style.visibility = flag ? "visible" : "hidden";
}

function setVisibilityForClass(className, visibility) {
    var elements = getElementsByClass(className);
    for (i = 0; i < elements.length; ++i) {
        setVisibility(elements[i], visibility);
    }
}

function setCustomerVisibility() {
    var isCustomer = document.cookie.indexOf("lexcustomer=") >= 0;
    setVisibilityForClass("nonCustomersOnly", isCustomer == false);
    setVisibilityForClass("customersOnly", isCustomer == true);
}

setCustomerVisibility();