function highlightPage() {
	if (!document.getElementById) return false;
	if (!document.getElementById("navbar")) return false;
	if (!document.getElementsByTagName) return false;
	var nav = document.getElementById("navbar");
	var links = nav.getElementsByTagName("a");
    var linkurl;
    for (var i=0; i<links.length; i++) {
        linkurl = links[i].getAttribute("href");
        if (window.location.href.indexOf(linkurl) != -1) {
            links[i].className = "here";
            var linktext = links[i].lastChild.nodeValue.toLowerCase();
            document.body.setAttribute("id",linktext);
        }
    }
    
}


function addClass(element,value) {
    if (!element.className) {
        element.className = value;
    } else { 
    newClassName = element.className;
    newClassName+= " ";
    newClassName+= value;
    element.className = newClassName;
    }
}


function focusLabels() {
	if (!document.getElementsByTagName) return false;
	var labels = document.getElementsByTagName("label");
	for (var i=0; i<labels.length; i++) {
		if (!labels[i].getAttribute("for")) continue;
		labels[i].onclick = function() {
			var id = this.getAttribute("for");
			if (!document.getElementById(id)) return false;
			var element = document.getElementById(id);
			element.focus()
		}
	}
}


function resetFields(whichform) {
	if (Modernizr.input.placeholder) return;
	for (var i=0; i<whichform.elements.length; i++) {
		var element = whichform.elements[i];
		if (element.type == "submit") continue;
		var check = element.placeholder || element.getAttribute('placeholder');
		if (!check) continue;
		element.onfocus = function() {
			var text = this.placeholder || this.getAttribute('placeholder');
			if (this.value == text) {
				this.className = '';
				this.value = "";
			}
		}
		element.onblur = function() {
			if (this.value == "") {
				this.className = 'placeholder';
				this.value = this.placeholder || this.getAttribute('placeholder');
			}
		}
		element.onblur();
	}
}


function isFilled(field) {
	if (field.value.replace(' ','').length == 0) return false;
	var placeholder = field.placeholder || field.getAttribute('placeholder');
	return (field.value != placeholder);
}


function isEmail(field) {
	return (field.value.indexOf("@") != -1 && field.value.indexOf(".") != -1);
}


function validateForm(whichform) {
	for (var i=0; i<whichform.elements.length; i++) {
		var element = whichform.elements[i];
		if ((element.required == 'required') || (element.getAttribute("required") == 'required')) {
			if (!isFilled(element)) {
				alert("Please fill in the "+element.name+" field.");
				return false;
			}
		}
		if ((element.type == 'email') || (element.getAttribute("id") == 'email')) {
			if (!isEmail(element)) {
				alert("The "+element.name+" field must be a valid email address.");
				return false;
			}
		}
	}
	return true;
}


function prepareForms() {
	for (var i=0; i<document.forms.length; i++) {
		var thisform = document.forms[i];
		resetFields(thisform);
		thisform.onsubmit = function() {
			validateForm(this);
		}
	}
}


function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            oldonload();
            func();
        }
	}
}


addLoadEvent(highlightPage);
addLoadEvent(focusLabels);
addLoadEvent(prepareForms);