JavaScript function that returns an array of random numbers without repetition

xRandom.js

/*  
 * xRandom
 * Returns an array of random numbers without repetition
 * array range, int limit
 */
function xRandom( range, limit ) {
    if( --limit >= range[1] || limit < 0 ) return;
    return (function _xr( i, r, result ) {
        var max = range[1], min = range[0], j = r.length, c=0,
            rand = Math.floor(Math.random() * (max - min + 1) + min);
        while( j-- ) {
            ( r[j] === rand ) ? c += 1 : c;
        }
        if( c === 0 ) {
            result.push( rand );
            r.push( rand );
            return ( i ) ? _xr( --i, r, result ) : result;
        } else {
            return _xr( i, r, result );
        }
    }(limit,[],[])); 
}
// How to use
var rand = xRandom( [1,10], 5 );