var showHide = function(showArray, hideArray){

    for(i = 0; i < showArray.length; i++){
        if( document.getElementById(showArray[i]) ){
            document.getElementById(showArray[i]).style.display = "block"; 
        }
    }

    for(i = 0; i < hideArray.length; i++){
        if( document.getElementById(hideArray[i])){
            document.getElementById(hideArray[i]).style.display = "none";
        }
    }  
    
}