var chaType_cookie = modify_getCookie("chaType");
var radios = document.getElementsByName("chaType");
var i;
var r;
try{

if (chaType_cookie.length >0)
{
	for (i=0; i<radios.length; i++)
	{
		r = radios[i]; 
		if (r.value == chaType_cookie)
			r.checked = true;
		else
			r.checked = false;
	}
}
}catch(e)
{
}
function modify_getCookie(name)//读cookie   
{   
 var arg = name + "=";   
 var alen = arg.length;   
 var clen = document.cookie.length;   
 var i = 0;   
 while(i < clen){   
  var j = i + alen;   
  if (document.cookie.substring(i, j) == arg){   
  return getCookieVal(j);   
  }   
  i = document.cookie.indexOf(" ", i) + 1;   
  if(i == 0) break;   
 }   
 return;   
}    

function getCookieVal(offset)   
{   
 var endstr = document.cookie.indexOf(";", offset);   
 if(endstr == -1){   
  endstr = document.cookie.length;   
 }   
 return unescape(document.cookie.substring(offset, endstr));   
}