1.Login to your blogger dashboard and go to Layout --> Page Elements.

2.Click on 'Add a Gadget' on the sidebar.

3.Select 'HTML/Javascript' and add the one of code given below and click save.

<script language=javascript>
var as = 1;
var bs = 3;
function statusbar()
{
var msg  = "TYPE-YOUR-TEXT-HERE";

var msg1  = "\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\";
var msg2  = "||||||||||||||||||";
var msg3  = "//////////////////";
var msg4  = "------------------";
if(as > 4)
as = 1;
if(bs < 1)
bs = 4;
timer = window.setTimeout("statusbar()",100);
var sds = eval("msg"+as);
var sds2 = eval("msg"+bs);
var ss =sds+"  "+msg+"  "+sds2;
window.status = ss;
as = as+1;
bs = bs-1;
}
statusbar(100);
</script>

Now you are done.