if (document.images){	
imag = new Array();
imag[0] = "front_images/FF4R3C2.gif";
imag[1] = "front_images/FF4R3C2on.gif";
imag[2] = "front_images/FF4R3C3.gif";
imag[3] = "front_images/FF4R3C3on.gif";

			
			im = new Array();
			for (var i = 0; i <= imag.length; i++)
			{
			im[i] = new Image();
			im[i].src = imag[i];
			}
		}

	function toggleImg(imgName,num){
		if (document.images){
			imgName.src = im[num].src
		}
	}