function chimg(img)
{
if(img)
{
document.getElementById('webhoimg').src='../img/tarife/' + img;
var nextt=1000;
}
else
{
var nextimg='and_go.gif';
var nextt=5000;
}



if(img=='and_go.gif')var nextimg='and_run.gif';
if(img=='and_run.gif')var nextimg='and_fly.gif';
if(img=='and_fly.gif')var nextimg='and_study.gif';


if(img=='and_study.gif'){var nextimg='and_go.gif';var nextt=5000;}

var intervalFunc = function () { chimg(nextimg);};
setTimeout( intervalFunc, nextt);
}