function createCustomAlert(title,txt,type,callback) {


if(type=='YESNOCANCEL') {
	var typeArray = new Array('YES','NO','CANCEL');
}
if(type=='YESNO') {
	var typeArray = new Array('YES','NO');
}
typeArray.reverse();

	d = document;

	if(d.getElementById("modalContainer")) return;

	mObj = d.getElementsByTagName("body")[0].appendChild(d.createElement("div"));
	mObj.id = "modalContainer";

	mObj.style.height = document.documentElement.scrollHeight + "px";

	alertObj = mObj.appendChild(d.createElement("div"));
	alertObj.id = "alertBox";
	alertObj.setAttribute('align','center');

	if(d.all && !window.opera) alertObj.style.top = document.documentElement.scrollTop + "px";
	alertObj.style.left = (d.documentElement.scrollWidth - alertObj.offsetWidth)/2 + "px";

	h1 = alertObj.appendChild(d.createElement("h1"));
	h1.appendChild(d.createTextNode(title));
	h1.setAttribute('align','left');

	msg = alertObj.appendChild(d.createElement("p"));
	msg.appendChild(d.createTextNode(txt));
	msg.setAttribute('align','left');

	for(var i=0; i<typeArray.length; ){

		btn = alertObj.appendChild(d.createElement("a"));
		btn.id = "btn";
		btn.appendChild(d.createTextNode(typeArray.pop()));
		btn.href = "#";
		btn.onclick = function() { return i; }

	}


	
}

// removes the custom alert from the DOM
function removeCustomAlert() {
	document.getElementsByTagName("body")[0].removeChild(document.getElementById("modalContainer"));
}


function showAlert() {
var text = 'tmp txt';
var title = 'tmp title';

var choice = -1;
	choice = createCustomAlert(title,text,'YESNOCANCEL','callbacks');

while (choice < 0)
{
     // do this while you wait
}

alert(choice);

}