function selllist()	{
	var el=document.getElementsByTagName('*');
		for (var i=0;i<el.length;i++){
		if(el[i].className=='sell_list'){
		el[i].style.display='none';
		}
	} 
}
function mblist(a)	{
	var listname;
	listname = "sell_list_" + a;
	selllist();
	document.getElementById(listname).style.display = 'block';
}