$(document).ready( function(){ 

	$(document).pngFix(); 
	
	var ie55 = (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) == 4 && 				navigator.appVersion.indexOf("MSIE 5.5") != -1);
	var ie6 = (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) == 4 && navigator.appVersion.indexOf("MSIE 6.0") != -1);

	$(".nav-image").each(
		function() {
	  		if (jQuery.browser.msie && (ie55 || ie6)) 
			{
				var li = $(this).parent();
				$(li).addClass('nav-image-placeholder');
				var span  = $(this).children('span');
				
				var off_filter = ($(span).css('filter'));
				var over_filter = off_filter.replace('-off.png', '-over.png');
				
				$(li).mouseover( function()
				{
					$(span).css('filter', over_filter);
				});
				
				$(li).mouseout( function(){
					$(span).css('filter', off_filter);
				});
			}
			else
			{
				$(this).mouseover( function()
				{
					var img_id = "#" + this.id + "-img";
					$(img_id).attr('src',"/images/navbar/" + this.id + "-over.png");
				});
				$(this).mouseout( function()
				{
					var img_id = "#" + this.id + "-img";
					$(img_id).attr('src',"/images/navbar/" + this.id + "-off.png");
				});
			}
		}	
	);
});