javascriptでCOOKIEを操作する関数

function Setcookie (name, value) {  //     name,  value Cookie  
        var argc = SetCookie.arguments.length;  
        var argv = SetCookie.arguments;      
        var path = (argc > 3) ? argv[3] : null;    
        var domain = (argc > 4) ? argv[4] : null;    
        var secure = (argc > 5) ? argv[5] : false;    
          
          
        document.cookie = name + "=" + value +   
        ((path == null) ? "" : ("; path=" + path)) +    
        ((domain == null) ? "" : ("; domain=" + domain)) +      
        ((secure == true) ? "; secure" : "");  
}  

function Deletecookie (name) {  //     name Cookie  
    var exp = new Date();    
    exp.setTime (exp.getTime() - 1);    
    var cval = GetCookie (name);    
    document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();  
}  
function Clearcookie()   //  COOKIE  
    {  
    var temp=document.cookie.split(";");  
    var loop3;  
    var ts;  
    for (loop3=0;loop3        {  
        ts=temp[loop3].split("=")[0];  
        if (ts.indexOf(’mycat’)!=-1)  
            DeleteCookie(ts);     //  ts “mycat”       
        }   
    }  

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

function GetCookie (name) {  //     name 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 null;  
}