var preloadFlag = false;

function preloadImages() {
	if (document.images) {
		pre_nav_publications_on = newImage('/images/nav_publications_on.jpg');
		pre_nav_contact_on = newImage('/images/nav_contact_on.jpg');
		pre_nav_projects_on = newImage('/images/nav_projects_on.jpg');
		pre_nav_home_on = newImage('/images/nav_home_on.jpg');
		pre_nav_team_on = newImage('/images/nav_team_on.jpg');
		preloadFlag = true;
	}
}

function perma_highlight ()
{
	var matches;
	var default_element = 'home';

	matches = location.pathname.match(/(testimonials|press|contact)\.shtml$/);

	if( matches != null )
	{
		var file;
		if( matches.length > 1 ) {
			file = matches[1];
		}
		else {
			file = default_element;
		}

		$('#nav_' + file + '_on').attr('src', '/images/nav_' + file + '_off.jpg');
	}
	
	else {
		matches = location.pathname.match('^/([a-zA-Z0-9_]+)/');

		if( matches != null ) 
		{ 
			var file; 

			if( matches.length > 1 ) 
			{ 
				file = matches[1]; 
			}
			else
			{
				file = default_element;
			}

			$('#nav_' + file + '_on').attr('src', '/images/nav_' + file + '_off.jpg');  
		}
		/*-----edit-----*/
		else {
			matches = location.pathname.match(/(\w+)\/$/);
			
			if( matches != null ) 
			{ 
				var file; 

				if( matches.length > 1 ) 
				{ 
					file = matches[1]; 
				}
				else
				{
					file = default_element;
				}

				$('#nav_' + file + '_on').attr('src', '/images/nav_' + file + '_off.jpg');  
			}
		}
		/*-----endEdit-----*/
	}
}


$(window).load(perma_highlight);

<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->