function ajax(type,file,text,func)
{
	var xmlhttp_object;
	try{xmlhttp_object = new activexobject("msxml2.xmlhttp");}
	catch(new_ieerror)
	{
		try{xmlhttp_object = new activexobject("microsoft.xmlhttp");}
		catch(ieerror){xmlhttp_object = false;}
	}
	if(!xmlhttp_object && typeof xmlhttp_object != "undefiend")
	{
		try{xmlhttp_object = new xmlhttprequest();}
		catch(new_ieerror){xmlhttp_object = false;}
	}
	type = type.touppercase();
	if(type == "get") file = file + "?" + text;
	xmlhttp_object.open(type,file,true);
	if(type == "post") xmlhttp_object.setrequestheader("content-type","application/x-www-form-urlencoded");
	xmlhttp_object.onreadystatechange = function responsereq()
	{
		if(xmlhttp_object.readystate == 4) func(xmlhttp_object.responsetext);
	};
	if(type == "get") text = null;
	xmlhttp_object.send(text);
}

function picresize(obj,maxwidth,maxheight)
{
	if(!window.xmlhttprequest)
	{
		obj.onload = null;
		img = new image();
		img.src = obj.src;
		if (img.width > maxwidth && img.height > maxheight)
		{
			if(img.width / img.height > maxwidth / maxheight)
			{
				obj.height = maxwidth * img.height / img.width;
				obj.width = maxwidth;
			}else{
				obj.width = maxheight * img.width / img.height;
				obj.height = maxheight;
			}
		}else if(img.width > maxwidth){
			obj.height = maxwidth * img.height / img.width;
			obj.width = maxwidth;
		}else if(img.height > maxheight){
			obj.width = maxheight * img.width / img.height;
			obj.height = maxheight;
		}else{
			obj.width = img.width;
			obj.height = img.height;
		}
	}
}

//新秀