// These functions provide a clean method of dealing with cookies
// This function sets a document cookie that will expire
// in one year from the time it was set.
//
function setDocumentCookie( oDoc, sName, sValue ) {
    if ( sName.length < 1 ) return;

    if ( 0 < sValue.length ) {
        // create a date for a year from now
        var expDate = new Date();
        //expDate.setTime( expDate.getTime() + 24*60*60*1000 );//Expira en 24 hs.
		expDate.setTime( expDate.getTime() + 3650*24*60*60*1000 );

        // Notice that the cookie is actually two assignment strings.
        //  The first is "cookiename=value" and the second is
        //  "expires=date".  The two assignments are  separated by a
        //  semicolon.  If you do not have the "expires" assignment
        //  the cookie will disappear when the visitor's browser exits.
        //
        oDoc.cookie = "" 
		              + sName + "=" + sValue + "; "
                      + "expires=" + expDate.toGMTString();
    }
    else {
        //  this will cause the named cookie to be deleted.
        oDoc.cookie = sName + "=";
    }
}

function deleteDocumentCookie( oDoc, sName ) {
    oDoc.cookie = sName + "=";
}

//
//  This function will fetch a named cookie
//
function fetchDocumentCookie( oDoc, sName ) {
    var sValue = "";
    var index = 0;

    //  The "cookie" property on the document is actually a
    //  single string of the form "name=value; name2=value2; ..."
    //  As a result we must search through the cookie string
    //  to find the name=value pair that we are looking for.
    //
    if( oDoc.cookie )
        index = oDoc.cookie.indexOf( sName + "=" );
    else
        index = -1;

    if ( index < 0 ) {
        sValue = "";
    }
    else {
        var countbegin = (oDoc.cookie.indexOf( "=", index ) + 1);
        if ( 0 < countbegin ) {
            var countend = oDoc.cookie.indexOf( ";", countbegin );
            if ( countend < 0 )
                countend = oDoc.cookie.length;
            sValue = oDoc.cookie.substring( countbegin, countend );
        }
        else {
            sValue = "";
        }
    }
    return sValue;
}

function setNamedCookie( sName, sValue ) {
    setDocumentCookie( document, sName, sValue );
}

function deleteCookie( sName ) {
    deleteDocumentCookie( document, sName );
}


function fetchNamedCookie( sName ) {
    return fetchDocumentCookie( document, sName );
}