var delay = 1; // seconds
var dance = 0;
function linkDance() {
 if(dance)
 {
  var linka = document.getElementById('catalog');
  if(linka) linka.style.color="#d0213e";
  dance=0;
 }
 else
 {
  var linka = document.getElementById('catalog');
  if(linka) linka.style.color="#1f4381";
  dance=1;
 }
setTimeout("linkDance()",delay*250);
}
setTimeout("linkDance()",1000);