var oldnid=1;
function changeHead(id) {

 document.getElementById("headerh1"+oldnid).style.display= "none";
 document.getElementById("headerh1"+id).style.display= "";
 document.getElementById("imager"+oldnid).style.display= "none";
 document.getElementById("imager"+id).style.display= "";
 
 oldnid=id;
 	
}