More setInterval function

var firstInterval;
 var secondInterval; 
 
function firstAlert () {
      IF (firstInterval) the clearInterval (firstInterval); // this is the focus 
      // handles all 
      ......... 
      firstInterval = the setInterval ( 'firstAlert ()', 1000 * 2 ); 
} 
 
 
function secondAlert () {
     IF (secondInterval) the clearInterval (secondInterval); // this is the focus 
 
        // handles all 
         ....... 
 
 
        secondInterval = the setInterval ( 'secondAlert ()', 1000 *. 3);