function addEvent(obj, evType, fn) {
	if (obj.addEventListener) {
		obj.addEventListener(evType, fn, false);
		return true;
	}
	else if (obj.attachEvent) {
		var r = obj.attachEvent("on" + evType, fn);
		return r;
	}
}

function showHide(idp){
	document.getElementById(idp).style.display=(document.getElementById(idp).style.display!='block')?'block':'none';
}