function pover(id,pic){
	document.getElementById('sp'+prev).src=prev_src;
	document.getElementById('sp'+id).src=pic;
	for(var i=0;i<pics;i++){		
		if(document.getElementById('spb'+i))document.getElementById('spb'+i).style.display="none";
	}
	document.getElementById('spb'+id).style.display="block";
}
function pout(id,pic){
	//document.getElementById('sp'+id).src=pic;	
	prev=id;
	prev_src=pic;
}