JavaScript setInterval "interval" parameter cannot be changed during runtime. Maybe there are other solutions using more params (not supported in I.E 7 and below) for setInterval (but we can add a polyfill I have seen). I have adapted and add comment to the solution of Peter Bailey (14/08/09) : http://stackoverflow.com/questions/1280263/changing…

JavaScript setCustomTimer

var intervals = [2,3,4,5];
var index = 0;


/**
 * Custom "setInterval" with internal function modifying the interval
 *
 * @param   callback    The function to call various times
 *          intervals   A duration using seconds 
 *          index       
 *
 */
function setCustomTimer( callback, intervals, index ) {
    var internalCallback = function( t, counter ) {
        return function() {
            
            // Call our internal callback routine with different interval of time
            window.setTimeout( internalCallback, 1000 * intervals[index] );
            
            // We don't care of the internal routine, that's the callback we really want :)
            callback();

            // The index will loop the fixed-size array again and again ; not tested with a filling array
            index++;
            if(index > intervals.length) {
                index = 0;
            }
        }
    }( intervals, 0 );

    window.setTimeout( internalCallback, intervals );
};

setCustomTimer( function(){ 

    // Call here any routine function
    console.log( 'bye' );
    
}, intervals, index );