function createRequestObject() {
     var ro;
     try {
	ro = window.XMLHttpRequest? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
     } catch (e) {
	// hmmmm ?
     }
     return ro;
}

var http = createRequestObject();

function ReplaceText(target, text) {
	document.getElementById(target).innerHTML = text;

}

function HideText(target) {
	document.getElementById(target).style.display = 'none';
}

function ShowText(target) {
	document.getElementById(target).style.display = 'block';
}

function AJAXError (err) {
	alert(err);
}