function createXMLHttp()
{var ajax=false;
try
	{
		ajax=new ActiveXObject("Msxml2.XMLHTTP");
	}
catch(e)
	{
		try{
				ajax=new ActiveXObject("Microsoft.XMLHTTP");
			}
		catch(e2)
			{
				ajax=false;	
			}
	}

if(!ajax && typeof XMLHttpRequest!='undefined')
{
		ajax=new XMLHttpRequest();
	}
	return ajax;
}

var ajax=new createXMLHttp();

function gets1(s2)
{
	//获得一级分类下拉列表
	ajax.open("get","gets2.php?s1=0&s2="+s2+"&rndnum="+escape(Math.random()),true);
	ajax.onreadystatechange=function()
	{
		if(ajax.readyState==4)
		{
			if(ajax.status==200)
			{
				if(ajax.responseText=="-1")
				{
					document.getElementById("divs1").innerHTML="<select><option>没有任何分类</option></select>";
				}
				else
				{
					document.getElementById("divs1").innerHTML=ajax.responseText;
					document.getElementById("divs2").innerHTML="<select><option>エリアを選択</option></select>";
				}
			}
		}
	}
	ajax.send(null);
}

function gets2(s1,s2)
{
	ajax.open("get","gets2.php?s1="+s1+"&s2="+s2+"&rndnum="+escape(Math.random()),true);
	ajax.onreadystatechange=updates2;
	ajax.send();
}
	
function updates2()
{
	if (ajax.readyState==4)
	{
		var oresponse=ajax.responseText;
		if (oresponse=="-1")
		{
			document.getElementById("divs2").innerHTML="<select><option value=0>没有子分类</option></select>";
			}
		else
		{
				document.getElementById("divs2").innerHTML=oresponse;
			}
	}
}