if (document.images) {

	image1on = new Image();
	image1on.src = "images/btn_home_on.png";
	image2on = new Image();
	image2on.src = "images/btn_careerop_on.png";
	image3on = new Image();
	image3on.src = "images/btn_resource_on.png";
	image4on = new Image();
	image4on.src = "images/btn_client_on.png";
	image5on = new Image();
	image5on.src = "images/btn_about_on.png";
	image6on = new Image();
	image6on.src = "images/btn_contact_on.png";
	
	image1off = new Image(); 
	image1off.src = "images/btn_home_off.png"; 
	image2off = new Image(); 
	image2off.src = "images/btn_careerop_off.png";
	image3off = new Image();
	image3off.src = "images/btn_resource_off.png";
	image4off = new Image();
	image4off.src = "images/btn_client_off.png";
	image5off = new Image(); 
	image5off.src = "images/btn_about_off.png";
	image6off = new Image();
	image6off.src = "images/btn_contact_off.png";

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