/**
 * get document element identified by ID
 *
 * @ param string e "element id"
 */ 
function getElement(e){
	if(document.all) return document.all[e];
	else return document.getElementById(e);
}


/**
 * change displayed image
 *
 * @param string id "object id"
 * @param string url "image url"
 */
function cImg(id,url){
	getElement(id).src = url;
}


/**
 * show document element
 *
 * @param string id "object id"
 */
function sE(id){
	getElement(id).style.display = "block";
	}


/**
 * hide document element
 *
 * @param string id "object id"
 */
function hE(id){
	getElement(id).style.display = "none";
	}


/**
 * change element's class name
 *
 * @param string id "object id"
 * @param string cn "new class name"
 */
function ccn(id,cn){
	getElement(id).className = cn;
	}