A simple function for getting parameters from a query string.

query.js

function query( key ) {
    if ( location.href.indexOf("?") !== -1 ) {
        var q = location.search,
            p = [],
            i, val;
        q = q.slice(1);
        if ( q.indexOf("&") !== -1 ) {
            q = q.split("&");
            for ( i=0; i < q.length; i++ ) {
                p.push( q[i].split("=") );
            }
            for ( i=0; i < q.length; i++ ) {
                if ( p[i][0] === key ) {
                    val = p[i][1];
                }
            }
        } else {
            p.push( q.split("=") );
            if ( p[0][0] === key ) {
                val = p[0][1];
            }
        }
        return val;
    } else {
        return false;
    }
}