Playing Script On A Certain Time?

Suppose I have some function ... myFunction(); And I want it to be executed from 3am - 11pm but not at any other time So far what i had done is along the line of

for(i=0;i<99999;i++)
{
var time = new Date();
var hours = time.getHours();

[code]....

If it is the right time it loops over and over and continually executes the function (which is what I want)If it's the wrong time (not 3am-11pm) it loops once, doesn't execute the functoin and then the script finishes (whereas I want it to continue looping until the right time comes along)If its the right time and then it moves to the wrong time it stops looping, whereas i want it to not execute the function but continue looping until the right time comes around again. So the overall affect is that at the given times of day the script plays and when its not the correct time it doesnt and then when it is the right time again it starts playing again, seemlessly and continually.