function getID_course(ID){
	return eval("document.getElementById('"+ID+"')")
}

function setDisplayHit_course(n,id){
	var idSplit=[""]
	if(n==1){
		idSplit=["","disC21","disC22","disC23"];
	}
	if(n==2){
		idSplit=["","disC21","disC22","disC23","disC24"];
	}
	if(n==3){
		idSplit=["","dis31","dis32"];
	}
	for(i=1;i<idSplit.length;i++){
		if(id==idSplit[i]){
			getID_course(idSplit[i]+"Content").style.display="";
			
		}else{
			getID_course(idSplit[i]+"Content").style.display="none";
		}
	}
	
}