if (document.images) {
	 
	b1_on = new Image();
	b1_on.src = "images/menu/on-3x1.gif";
	b1_off = new Image();
	b1_off.src = "images/menu/off-3x1.gif";
	
	b2_on = new Image();
	b2_on.src = "images/menu/on-4x1.gif";
	b2_off = new Image();
	b2_off.src = "images/menu/off-4x1.gif";
	
	b3_on = new Image();
	b3_on.src = "images/menu/on-5x1.gif";
	b3_off = new Image();
	b3_off.src = "images/menu/off-5x1.gif";
	
	b4_on = new Image();
	b4_on.src = "images/menu/on-6x1.gif";
	b4_off = new Image();
	b4_off.src = "images/menu/off-6x1.gif";
	
	b5_on = new Image();
	b5_on.src = "images/menu/on-7x1.gif";
	b5_off = new Image();
	b5_off.src = "images/menu/off-7x1.gif";
	
		b6_on = new Image();
	b6_on.src = "images/menu/on-8x1.gif";
	b6_off = new Image();
	b6_off.src = "images/menu/off-8x1.gif";
	
		b7_on = new Image();
	b7_on.src = "images/menu/on-9x1.gif";
	b7_off = new Image();
	b7_off.src = "images/menu/off-9x1.gif";
	
	b8_on = new Image();
	b8_on.src = "images/menu/on-10x1.gif";
	b8_off = new Image();
	b8_off.src = "images/menu/off-10x1.gif";
	
	b9_on = new Image();
	b9_on.src = "images/menu/on-11x1.gif";
	b9_off = new Image();
	b9_off.src = "images/menu/off-11x1.gif";
		b10_on = new Image();
	b10_on.src = "images/menu/on-12x1.gif";
	b10_off = new Image();
	b10_off.src = "images/menu/off-12x1.gif";
						} 
function dsgo(imgName) { 
        if (document.images) { 
            document[imgName].src = eval(imgName + "_on.src"); 
        } 
} 
function dsleave(imgName) { 
        if (document.images) { 
            document[imgName].src = eval(imgName + "_off.src"); 
        } 
}