/*
 * Return parameter value of name (case sensitive !)
 */
function get_value(parametername)
{
    readvalue=(location.search ? location.search.substring(1) : false);

    if (readvalue)
    {
       parameter=readvalue.split('&');
       for (i=0; i<parameter.length; i++)
       {
           if (parameter[i].split('=')[0] == parametername)
             return parameter[i].split('=')[1];
       }
    }
    return false;
}