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


/**
 * show/hide document object
 *
 * @param string obj "object id"
 */
function sh(obj){
	var stat = getElement(obj).style.display;

	switch(stat){
		case "block":
			getElement(obj).style.display = "none";
			break;
		case "none":
			getElement(obj).style.display = "block";
			break;
	}
}


/**
 * change element class name
 *
 * @param string obj "object id"
 * @param string cname "class name" 
 */
function ccn(obj,cname){
	var stat = getElement(obj).className;

	switch(stat){
		case cname:
			getElement(obj).className = "";
			break;
		case "":
			getElement(obj).className = cname;
			break;
	}
}