var currTip = 0;
var tips = Array();
tips[0] = "Search e.g. in protein";
tips[1] = "Search e.g. in animal";
tips[2] = "Search e.g. in sheep";
tips[3] = "Search e.g. in pigs";
 
function showNextTip(){
  currTip++;
  if (currTip == tips.length){ currTip = 0; }
  document.getElementById("tipText").innerHTML = tips[currTip];
}