function valtas(id){
    stopSlide();
     for(var i=1;i<6;i++){
        var v = document.getElementById("va"+i);
        v.style.display = "none";
    }
    var v2 = document.getElementById("va"+id);
        v2.style.display = "block";  
    }

var j = 0 
function runSlideShow(id){ 
    for(var i=1;i<6;i++){
        var v = document.getElementById("va"+i);
        v.style.display = "none";
    }
    var v2 = document.getElementById("va"+id);
        v2.style.display = "block";

    j=j+1;    
    t = setTimeout('runSlideShow("'+j+'")', 4000); 
    if(j==5)j=0; 
}

function stopSlide()
{
clearTimeout(t);
}