// ***** library *****

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function')window.onload = func;
	else window.onload = function() {
		if(oldonload)oldonload();
		func();
	}
}
function GetObj(asElemId) {
	var objHtml=document.getElementById(asElemId);
	if(objHtml==null)alert("GetObj(): failed finding ["+asElemId+"]");
	return objHtml;
}
function Visible(aLayerObj,abShow) {
	aLayerObj.style.display= abShow?"block":"none";
}