if (document.images) {            
	sn = new Image();	sn.src = "imag/bulet.gif";
	sa = new Image();	sa.src = "imag/bulet_off.gif";
}

function HoverAOn(imgName) {document['s_'+imgName].src=sa.src;}
function HoverAOff(imgName) {document['s_'+imgName].src=sn.src}