function ShowCookie(cName){//展示cookie中的每个键值对
  var i;
  var value = document.cookie;
  var arr1 = value.split(";");
  var sCookie = ""; 
  for(i=0;i<arr1.length;i++){
    if(value.length == 0){
      break;
    }
    sName =  strim(arr1[i].split("=")[0]);
    sValue =  strim(arr1[i].split("=")[1]); 
	if (sName == cName) {
		sCookie = sValue; 
	}
  }
  return sCookie;
}

function strim(sT)  
{  
   return  sT.replace(/(^\s*)|(\s*$)/g,  "");  
}  

function setcookie(cname,cvalue,cdate)
{
   var expires = new Date();
   expires.setTime(expires.getTime() + cdate);
   document.cookie=cname + "=" + escape(cvalue) + ";path=/;expires=" + expires.toGMTString();
   //alert("设置了一个名为" + cname + "的cookie.值是:" + cvalue + "过期时间是:" + expires.toGMTString());
}