var count = -1;
var counter;
var nchar;
var speed = 200; //ñêîðîñòü ñìåíû òåêñòà
var a = new Array();
a[1] = "Èíòåðüåðíûé áàãåò, ëåïíèíà"; // ñèìâîëû ñòðîêè áóäóò çàìåíåíû
a[2] = "èÍÒÅÐÜÅÐÍÛÉ ÁÀÃÅÒ, ËÅÏÍÈÍÀ"; // íà ñèìâîëû ýòîé
len = a[1].length;
function animation() {
 count++
 if (count == 0){
   document.myform.display.value = a[1];
 }
 if (count == 1){
   document.myform.display.value = a[2].substring
   (0, 1) + a[1].substring(len, 1);
 }
 if (count > 1){
   a[3] = a[1].substring(0, count - 1) + a[2].substring(count 
   - 1,count) + a[1].substring(len, count);
   document.myform.display.value = a[3];
 }
 if(count == a[1].length){
   count = -1;
 }
 counter = setTimeout("animation()",speed);
 }