Array containing the refresh rate in milliseconds for each speed. The lower value is for a faster scroll.
It is not recommended to use a value less than 20 milliseconds for the refresh rate otherwise the computer may slow down.
A scrolling ticker supports tree speeds (by default) or more if you define more speed.
The settings for each speed are defined with TICKER_SCROLL_RATES and TICKER_SCROLL_STEPS.
If you are using more than one scrolling ticker in your application, all the scrolling tickers are paused.
Default values are as follow:
TICKER_SCROLL_RATES = new Array(50,20,30);
Where 50 is the refresh rate for the speed 1, 20 for the speed 2 and 30 for the speed 3.
