var z=document.images?1:0,m=0;
if (z) {
	var m0 = new Array(), m1 = new Array(), s0 = new Image(), s1=new Image(); 
	s0.src = 'img/s0.gif';
	s1.src = 'img/s1.gif';

	for(i=1; i<5; i++){
		m0[i] = new Image();
		m0[i].src = 'img/m'+i+'_0.gif';
		m1[i] = new Image();
		m1[i].src='img/m'+i+'_1.gif';
	}
}
function _m(i,n){
	if(!z)return;
	if(n){
		document.images['m'+i].src=m1[i].src;
		document.images['s'+i].src=s1.src;
		if(i<3)document.images['s'+(i+1)].src=s1.src;
		m=i;
	} else {
		document.images['m'+i].src=m0[i].src;
		if(m!=0){
			document.images['s'+m].src=s0.src;
			if(m<3)document.images['s'+(m+1)].src=s0.src;
		}
	}
}