javascript cookie

<script language="JavaScript">

function set ()
{
    var expdate = new Date();
    expdate.setMonth(expdate.getMonth()+6);
   alert("setting cookie \""+form1.txtName.value+"\" to \""+form1.txtValue.value+"\"");
    setCookie(form1.txtName.value, form1.txtValue.value, expdate);
}

function get ()
{
   alert("getting cookie \""+form1.txtName.value+"\"");
    var c = getCookie(form1.txtName.value);
    alert( "cookie = "+c );

    form1.txtValue.value = c;
}

function getCookie (sCookieName)
{
    var sName=sCookieName+"=", ichSt, ichEnd;
    var sCookie=document.cookie;

    if ( sCookie.length && ( -1 != (ichSt = sCookie.indexOf(sName)) ) )
    {
        if (-1 == ( ichEnd = sCookie.indexOf(";",ichSt+sName.length) ) )
            ichEnd = sCookie.length;
        return unescape(sCookie.substring(ichSt+sName.length,ichEnd));
    }
   
    return null;
}
  
function setCookie (sName, vValue)
{
    var argv = setCookie.arguments, argc = setCookie.arguments.length;
    var sExpDate = (argc > 2) ? "; expires="+argv[2].toGMTString() : "";
    var sPath = (argc > 3) ? "; path="+argv[3] : "";
    var sDomain = (argc > 4) ? "; domain="+argv[4] : "";
    var sSecure = (argc > 5) && argv[5] ? "; secure" : "";
    document.cookie = sName + "=" + escape(vValue,0) + sExpDate + sPath + sDomain + sSecure + ";";
}
   
function deleteCookie (sName)
{
    document.cookie = sName + "=" + getCookie(sName) + "; expires=" + (new Date()).toGMTString() + ";";
}