function showElement(el_id) {
    var el = document.getElementById(el_id);
    if (el) el.style.display = "";
	} // end fn
	
	function hideElement(el_id) {
    var el = document.getElementById(el_id);
    if (el) el.style.display = "none";
	} // end fn
	
	function toggleElement(el_id) {
    var el = document.getElementById(el_id);
    if (el) {
	    if (el.style.display != "none") {
	    	el.style.display = "none";
	    }
	    else {
	    	el.style.display = "";
	    } // end if else
	  }
	} // end fn