function gup(queryString, parameterName)
{
        // Add "=" to the parameter name (i.e. parameterName=value)
        var parameterName = parameterName + "=";
        if ( queryString.length > 0 ) {
        // Find the beginning of the string
        begin = queryString.indexOf ( parameterName );
        // If the parameter name is not found, skip it, otherwise return the value
        if ( begin != -1 ) {
        // Add the length (integer) to the beginning
        begin += parameterName.length;
        // Multiple parameters are separated by the "&" sign
        end = queryString.indexOf ( "&" , begin );
        if ( end == -1 ) {
        end = queryString.length
        }
        // Return the string
        return unescape ( queryString.substring ( begin, end ) );
        }
        // Return "null" if no parameter has been found
        return "null";
        }
}
var jcs;
var queryString = window.top.location.search.substring(1);
jcs = gup(queryString,"Jcs");
jcs = parseInt(jcs);