var ie6 = (navigator.appVersion.indexOf("MSIE 6.") > -1);

var navImagePath = "/img/nav/";

function initialize() {

	var n;
	var loader;
	var img;
	var a;
	var navItems = ["home", "practice", "healthcare", "midwifery", "resources", "contact"];	
	
	//ie6 - logo link
	if (ie6) {
		document.getElementById("logo").onclick = function() {
			location.href = "/";
		}
	}
	
	
	for (n = 0; n < navItems.length; n++) {
	
		//preload nav images
		loader = new Image();
		loader.src = navImagePath + navItems[n] + "_on.png";

		//nav rollovers
		img = document.getElementById("nav_img_" + navItems[n]);
		img.originalSrc = img.src;

		if (ie6) {
		
			a = document.getElementById("nav_" + navItems[n]);
			isOn = (img.src.indexOf("_on.png") > -1) ? "_on" : "";
			a.originalFilter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/nav/" + navItems[n] + isOn + ".png');";
		
			document.getElementById("nav_" + navItems[n]).innerHTML = "<img src='/img/global/spacer.gif' width='100' height='22'>";
			
			document.getElementById("nav_" + navItems[n]).onmouseover = function() {
				var keyword = this.id.split("nav_").join("");
				var div = this;
				div.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/nav/" + keyword + "_on.png');";
			}
		
			document.getElementById("nav_" + navItems[n]).onmouseout = function() {
				var keyword = this.id.split("nav_").join("");
				var div = this;
				div.style.filter = div.originalFilter;
			}
			
			document.getElementById("nav_" + navItems[n]).onmouseout();
		
		} else {

			document.getElementById("nav_" + navItems[n]).onmouseover = function() {
				var keyword = this.id.split("nav_").join("");
				var img = document.getElementById("nav_img_" + keyword);
				img.src = navImagePath + keyword + "_on.png";
			}
		
			document.getElementById("nav_" + navItems[n]).onmouseout = function() {
				var keyword = this.id.split("nav_").join("");
				var img = document.getElementById("nav_img_" + keyword);
				img.src = img.originalSrc;
			}
			
		}

	}

}



/*
#nav_home 		{display:block; height:22px; width:57px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/nav/home.png');}
#nav_practice 	{display:block; height:22px; width:109px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/nav/practice.png');}
#nav_healthcare {display:block; height:22px; width:89px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/nav/healthcare.png');}
#nav_midwifery 	{display:block; height:22px; width:81px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/nav/midwifery.png');}
#nav_resources 	{display:block; height:22px; width:91px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/nav/resources.png');}
#nav_contact 	{display:block; height:22px; width:97px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/nav/contact.png');}
	<div class="nav"><a id="nav_home"        href="/"           ><img id="nav_img_home"        src="/img/nav/home.png"           width="57"   alt="Home"         /></a></div>
	
*/