var aaaa,c;


function showHide(s){

c = aaaa;

var defaultDiv = 'a'


		if(c != undefined){
			document.getElementById(c).style.display = 'none';
		}
		else {
			document.getElementById(defaultDiv).style.display = 'none';
		}

			document.getElementById(s).style.display = 'block';

aaaa = s;


}