function menuDiv(tahw) {
  what1 = "ik_menu";
  what2 = "pd_menu";
  what3 = "ia_menu";
  what4 = "ba_menu";


  what  = tahw + "_menu"

    
    if(what==what1){
		document.getElementById(what1).style.display = "";
		document.getElementById(what2).style.display = "none";
		document.getElementById(what3).style.display = "none";
		document.getElementById(what4).style.display = "none";


		}
    if(what==what2){
		document.getElementById(what1).style.display = "none";
		document.getElementById(what2).style.display = "";
		document.getElementById(what3).style.display = "none";
		document.getElementById(what4).style.display = "none";
		
		}
	if(what==what3){
		document.getElementById(what1).style.display = "none";
		document.getElementById(what2).style.display = "none";
		document.getElementById(what3).style.display = "";
		document.getElementById(what4).style.display = "none";
		
		}
		
	if(what==what4){
		document.getElementById(what1).style.display = "none";
		document.getElementById(what2).style.display = "none";
		document.getElementById(what3).style.display = "none";
		document.getElementById(what4).style.display = "";
		
		}		
	
}