var t=0, d=-1, introAnimation;

function startIntroAnimation() {
  introAnimation = setInterval(function(){
    t += 310*d; if(t==0 || t==-(310*2)) d = -d;
    $('news').morph({left:t+'px'},{duration:1.5});
  },5000);
}

function stopIntroAnimation() {
  if(introAnimation) clearInterval(introAnimation);
  introAnimation = null;
}

var t2=0, d2=-1, introAnimation2;

function startIntroAnimation2() {
  introAnimation2 = setInterval(function(){
    t2 += 310*d2; if(t2==0 || t2==-(310*2)) d2 = -d2;
    $('news2').morph({left:t2+'px'},{duration:0.7});
  },3700);
}

function stopIntroAnimation2() {
  if(introAnimation2) clearInterval(introAnimation2);
  introAnimation2 = null;
}

var t3=0, d3=-1, introAnimation3;

function startIntroAnimation3() {
  introAnimation3 = setInterval(function(){
    t3 += 310*d3; if(t3==0 || t3==-(310*2)) d3 = -d3;
    $('news3').morph({left:t3+'px'},{duration:0.9});
  },7700);
}

function stopIntroAnimation3() {
  if(introAnimation3) clearInterval(introAnimation3);
  introAnimation3 = null;
}