function InitAjax()
{
	var ajax=false;
	try {
	ajax = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
	try {
	ajax = new ActiveXObject("Microsoft.XMLHTTP");
	} catch (E) {
	ajax = false;
	}
  }
	if (!ajax && typeof XMLHttpRequest!='undefined') { 
	ajax = new XMLHttpRequest(); 
  } 
	return ajax;
}
function $(a){ return document.getElementById(a);}
function YmAjax(i,t)
{

	var FrmUrl;
	switch (t)
	{
	case 1:	//颜色
		FrmUrl="&v=" + escape($("cor_shopping"+i).value);
		break;
	case 2: //尺寸
		FrmUrl="&v=" + escape($("size_shopping"+i).value);
		break;
	case 3: //数量
		FrmUrl="&v=" + escape($("quantity"+i).value);
		break;
	}

	FrmUrl="i=" + i + "&t=" + t + FrmUrl;

	var x = InitAjax();
	if (x)
	{
		x.onreadystatechange=function(){
			
			if (x.readyState==4)
			{
				if (x.status==200)
				{
					eval(x.responseText);
				}

			}
			else
			{
				$('msg').innerHTML='正在提交数据..';
			}
		}
	
		x.open("post","ajax/cart.asp",true);
		x.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
		var SendData=FrmUrl;
		x.send(SendData);
	}
}
function mEmpty()
{
$('msg').innerHTML='';
}