Auto complete

function dorequest(url,passOn){
	var ajaxRequest;
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something went wrong
				alert("Request failed");
				return false;
			}
		}
	}
	// Create a function that will receive data sent from the server
	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState == 4){
		   display(ajaxRequest.responseText,ajaxRequest.responseXML,passOn); 
		}
	}
	ajaxRequest.open("GET",url , true);
	ajaxRequest.send(null); 
}
 
function display(text, XML, sender){
		var name = XML.getElementsByTagName("name")[0].childNodes[0].nodeValue;
		var pos = getCaretPosition(sender);
		sender.value = sender.value + name;
		setCaretPosition(sender,pos);
		setSelectionRange(sender,pos,String(sender.value).length);
	}
}
 
function setSelectionRange(textElem, selectionStart, selectionEnd) {
	if (textElem.setSelectionRange) { // FF
		textElem.setSelectionRange(selectionStart,selectionEnd);
	} else if (textElem.createTextRange) { // IE
		var range = textElem.createTextRange();
		range.collapse(true);
		range.moveEnd('character', selectionEnd);
		range.moveStart('character', selectionStart);
		range.select();
	}
}
 
function setCaretPosition(ctrl, pos){
	if(ctrl.setSelectionRange){
		ctrl.setSelectionRange(pos,pos);
	}
	else if (ctrl.createTextRange) {
		var range = ctrl.createTextRange();
		range.collapse(true);
		range.moveEnd('character', pos);
		range.moveStart('character', pos);
		range.select();
	}
}
 
function getCaretPosition (ctrl) {
	var CaretPos = 0;
	if (document.selection) {
		ctrl.focus ();
		var Sel = document.selection.createRange ();
		Sel.moveStart ('character', -ctrl.value.length);
		CaretPos = Sel.text.length;
	}
	else if (ctrl.selectionStart || ctrl.selectionStart == '0')
		CaretPos = ctrl.selectionStart;
	return (CaretPos);
}
 
function show_suggest(e,sender){
	var code;	
	if (!e) var e = window.event;
	if (e.keyCode) code = e.keyCode;
	else if (e.which) code = e.which;
	if (code >= 48 && code <= 90){
		var url = "ajax.php?letters="+sender.value;
		dorequest(url,sender);
	}
}