if(document.images) {
// Off States
img0off = new Image(); 
img0off.src = "images/profile.gif";
img1off = new Image(); 
img1off.src = "images/comp_projects.gif";
img2off = new Image(); 
img2off.src = "images/in_progress.gif";
img3off = new Image(); 
img3off.src = "images/contact.gif";

// On States
img0on = new Image(); 
img0on.src = "images/profile_color.gif";
img1on = new Image(); 
img1on.src = "images/comp_projects_color.gif";
img2on = new Image(); 
img2on.src = "images/in_progress_color.gif";
img3on = new Image(); 
img3on.src = "images/contact_color.gif";
}

function changeImage(oldName, newName) {
if (document.images) {
newSource = eval(newName + ".src");
document[oldName].src = newSource;
}
}