function swap_m(img_name,to_what) {
	var swap, towhat;
	swap	= eval('document.images.'+img_name);
	towhat='/_img/'+to_what+'.gif';
	swap.src	= towhat;
}

function swap_j(img_name,to_what) {
	var swap, towhat;
	swap	= eval('document.images.'+img_name);
	towhat='/_img/'+to_what+'.jpg';
	swap.src	= towhat;
}