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);

// Form Functions

// Form Field Clear On Click
function clearOnClick(id, content) {
	elem = document.getElementById(id);
	if (elem.value == content) {
		elem.value = "";
	}
}

// Form Field Replacement On Empty
function replaceOnEmpty(id, content) {
	elem = document.getElementById(id);
	if (elem.value == "") {
		elem.value = content;
	}
}

// E-mail Address Validator
//  - Credit http://www.tizag.com/javascriptT/javascriptform.php
function emailValidator(id, helperMsg) {
	elem = document.getElementById(id);
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	if (elem.value.match(emailExp)) {
		return true;
	} else{ 
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

// Wrapper for E-Mail Validator
function send(form, id, helperMsg) {
	if (emailValidator(id, helperMsg)) {
		get(document.getElementById(form));
	}
}

// AJAX Form POST
//  - Credit http://www.captain.at/howto-ajax-form-post-get.php
var http_request = false;
function makeRequest(url, parameters) {
  http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari,...
	 http_request = new XMLHttpRequest();
	 if (http_request.overrideMimeType) {
		// set type accordingly to anticipated content type
		//http_request.overrideMimeType('text/xml');
		http_request.overrideMimeType('text/html');
	 }
  } else if (window.ActiveXObject) { // IE
	 try {
		http_request = new ActiveXObject("Msxml2.XMLHTTP");
	 } catch (e) {
		try {
		   http_request = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e) {}
	 }
  }
  if (!http_request) {
	 alert('Cannot create XMLHTTP instance');
	 return false;
  }
  http_request.onreadystatechange = alertContents;
  http_request.open('GET', url + parameters, true);
  http_request.send(null);
}

function alertContents() {
  if (http_request.readyState == 4) {
	 if (http_request.status == 200) {
		//alert(http_request.responseText);
		result = http_request.responseText;
		document.getElementById('newsletter_email').value = result;
	 } else {
		alert('There was a problem with the request.');
	 }
  }
}

function get(obj) {
  var getstr = "?";
  for (i=0; i<obj.childNodes.length; i++) {
	 if (obj.childNodes[i].tagName == "INPUT") {
		if (obj.childNodes[i].type == "text" || obj.childNodes[i].type == "hidden") {
		   getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
		}
		if (obj.childNodes[i].type == "checkbox") {
		   if (obj.childNodes[i].checked) {
			  getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
		   } else {
			  getstr += obj.childNodes[i].name + "=&";
		   }
		}
		if (obj.childNodes[i].type == "radio") {
		   if (obj.childNodes[i].checked) {
			  getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
		   }
		}
	 }   
	 if (obj.childNodes[i].tagName == "SELECT") {
		var sel = obj.childNodes[i];
		getstr += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
	 }
	 
  }
  makeRequest('/core/get.php', getstr);
}