function tabit(id,cid){
document.getElementById("img1").src="images/img1.jpg";
document.getElementById("img2").src="images/img2.jpg";
document.getElementById("img3").src="images/img3.jpg";

/*document.getElementById("tab6").className="menu2";
document.getElementById("tab7").className="menu2";*/
document.getElementById("ctab1").style.display="none";
document.getElementById("ctab2").style.display="none";
document.getElementById("ctab3").style.display="none";

/*document.getElementById("ctab6").style.display="none";
document.getElementById("ctab7").style.display="none";*/
document.getElementById(id).src="images/"+id+"_.jpg";
document.getElementById(cid).style.display="block";
 
}