if (document.images) {

         image1on = new Image();
         image1on.src = "images/footer_1_on.gif";
         image2on = new Image();
         image2on.src = "images/footer_2_on.gif";
         image3on = new Image();
         image3on.src = "images/footer_3_on.gif";
         image4on = new Image();
         image4on.src = "images/footer_4_on.gif";
		 image5on = new Image();
         image5on.src = "images/port_icon_web_on.gif";
         image6on = new Image();
         image6on.src = "images/port_icon_print_on.gif";
		 image7on = new Image();
         image7on.src = "images/port_navarrow_left_on.gif";
         image8on = new Image();
         image8on.src = "images/port_navarrow_right_on.gif";
  		 
         image1off = new Image(); 
         image1off.src = "images/footer_1_off.gif"; 
         image2off = new Image(); 
         image2off.src = "images/footer_2_off.gif";
         image3off = new Image();
         image3off.src = "images/footer_3_off.gif";
         image4off = new Image();
         image4off.src = "images/footer_4_off.gif";
		 image5off = new Image();
         image5off.src = "images/port_icon_web_off.gif";
         image6off = new Image();
         image6off.src = "images/port_icon_print_off.gif";
		 image7off = new Image();
         image7off.src = "images/port_navarrow_left.gif";
         image8off = new Image();
         image8off.src = "images/port_navarrow_right.gif";
		 
	}
	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");
	}
	}