var lastTarget = null;
function showdiv(targetid,objN){
		var target=document.getElementById(targetid);
		if (target.style.display=="block"){
				target.style.display="none";               
		} else {
				target.style.display="block";              
		}
		 if(lastTarget && lastTarget !== target){
				lastTarget.style.display="none";
		}
		lastTarget = target;

}