var this_arr = new Array('content_inner','control2_inner','content_start');    

function showDiv( id, arr, dontHide){
	if (arr == null){
		arr = this_arr;
	} 
	if (dontHide != null){
		arr = arr.without(dontHide);
	}
	for (var index = 0; index < arr.length; ++index) {	 
		hideAllDivWithClass(arr[index]);	
	} 
	if($(id)!=null){	
		$(id).style.display='block';    
	}
}
    	 
function hideAllDivWithClass(cLass){ 
	for (var index = 0; index < $$('div.'+cLass).length; ++index) {
		var item = $$('div.'+cLass)[index];	 
		item.hide();	
	} 
}