<!-- 

function preLoad() {

nav_about_us = new Image();
nav_about_us.src = "images/nav_about_us_on.gif";

nav_services = new Image();
nav_services.src = "images/nav_services_on.gif";

nav_portfolio = new Image();
nav_portfolio.src = "images/nav_portfolio_on.gif";

nav_case_study = new Image();
nav_case_study.src = "images/nav_case_study_on.gif";

nav_process = new Image();
nav_process.src = "images/nav_process_on.gif";

nav_help = new Image();
nav_help.src = "images/nav_help_on.gif";

nav_home = new Image();
nav_home.src = "images/nav_home_on.gif";
}

if (document.images) { 

image4on = new Image();
image4on.src = "images/nav_case_study_on.gif";

image4off = new Image();
image4off.src = "images/nav_case_study.gif"

image6on = new Image();
image6on.src = "images/nav_help_on.gif";

image6off = new Image();
image6off.src = "images/nav_help.gif";

image7on = new Image();
image7on.src = "images/nav_home_on.gif";

image7off = new Image();
image7off.src = "images/nav_home.gif";
}

function changeImages() {

if (document.images) { 
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
}
}
}

// -->