function htrace(txt){

	document.getElementById("trace").innerHTML += "<br /><b>trace:</b> " + txt;
	

}

function resetTrace(){
	$("#trace").html("  ");

}

function isEmpty(val){

	if(val==null || val==undefined || val=="")
		return true;
	else
		return false;

}


function pVal(val, prefix, suffix){
	var e = (isEmpty(val));
	prefix =  e ? "" : prefix;
	suffix = e ? "" : suffix;
	var f =  (e) ? "" : prefix + val + suffix;
	return f;
}