function imgOn(imgName) {
	if (document.images) {
	   	document.images[imgName].src = eval(imgName + "On").src;
	}
}

function imgOff(imgName) {
	if (document.images) {
		document.images[imgName].src = eval(imgName + "Off").src;
	}
}

if (document.images){
	aboutusOn = new Image();
	aboutusOn.src = "images/nav_aboutus_hi.gif";
	aboutusOff = new Image();
	aboutusOff.src = "images/nav_aboutus.gif";
	
	programOn = new Image();
	programOn.src = "images/nav_program_hi.gif";
	programOff = new Image();
	programOff.src = "images/nav_program.gif";
	
	admissionsOn = new Image();
	admissionsOn.src = "images/nav_admissions_hi.gif";
	admissionsOff = new Image();
	admissionsOff.src = "images/nav_admissions.gif";
	
	careerOn = new Image();
	careerOn.src = "images/nav_career_hi.gif";
	careerOff = new Image();
	careerOff.src = "images/nav_career.gif";
	
	infoOn = new Image();
	infoOn.src = "images/nav_info_hi.gif";
	infoOff = new Image();
	infoOff.src = "images/nav_info.gif";
	
}