<!--
var Cookies={
	  // 创建cookie 
	  createCookie:function(cn,cv,d,dm){
     	   var now=new Date();
     	   var expire=new Date();
     	   if(d==null||d==0)d=1;
     	    
     	   expire.setTime(now.getTime()+3600000*24*d);
     	   document.cookie=cn+"="+escape(cv)+";expires="+expire.toGMTString()+";domain="+dm+"; path=/";
    },
    // 删除cookie
    deleteCookie:function(name){
    	var exp = new Date();   
    	exp.setTime (exp.getTime() - 1);   
    	var cval = this.readCookie (name);
    	if(cval){
     		document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();  
    	}
    },
    // 读取cookie
    readCookie:function(cn){
     	   var dc=document.cookie;
     	   var prefix=cn+"=";
     	   var begin=dc.indexOf("; "+prefix);
     	    
     	   if(begin==-1){
     	    	  begin=dc.indexOf(prefix);
     	    	  if(begin!=0)return null;
     	   }
         else{
          	  begin+=2;
         }
          
         var end=document.cookie.indexOf(";",begin);          
         if(end==-1){end=dc.length;}        
         return unescape(dc.substring(begin+prefix.length,end));
    } 	
}
//-->