function hideall(){
	hideElementsByClassName('sb');
	hideElementsByClassName('q_desc');
	hideElementsByClassName('big_box');
}
function show_desc(element){					
	hideall();
	
	var w = $(element);
	var x = w.getElementsByClassName('sb')[0];
	x.show();
	
	var box = element + "_box";
	var text = element + "_desc";
	var y = document.getElementById(box);
	var z = document.getElementById(text);
	$(y).show();
	$(z).show();
}
function hideElementsByClassName(t){
	var a = document.getElementsByClassName(t);
	//loop through the array and hide each element by id
	for (var i=0;i<a.length;i++){
		$(a[i]).hide();	
	}		  
}