function change2(sc, hi){
if(sc!=str){
ob = document.getElementById("frame2");
frame2.location.href = "img/"+ sc +".htm";
ob2 = document.getElementById("tab1");
ob3 = document.getElementById("nagl");
ob3.src = "img/"+sc+"4.jpg";
ob2.style.height = hi;
ob.style.height = hi;
t = sc+"3";
document[sc].src = "img/"+t+".jpg";
t = str+"1";
document[str].src = "img/"+t+".jpg";
str=sc;
return str;}
}

function lab(ob, str)
{
if(str!==ob){
t = ob+"2";
document[ob].src = "img/"+t+".jpg";}
}

function lab2(ob, str)
{
if(str!==ob){
t = ob+"1";
document[ob].src = "img/"+t+".jpg";}
}