var xmlHttp
function getcaptcha(){
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null){
		alert ("Browser does not support HTTP Request");
		return;
	}
	var url="capcha.php";
	url=url+"?sid="+Math.random();
	xmlHttp.onreadystatechange=stateChangedDATA
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function stateChangedDATA(){
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
//		document.getElementById("captcha").innerHTML=xmlHttp.responseText
		img = document.getElementById('captcha'); 
	   //Change the image
		img.src = 'create_image.php?' + Math.random();
	}
}
function GetXmlHttpObject(){
	var xmlHttp = null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp = new XMLHttpRequest();
	} 
	catch (e) {
		//Internet Explorer
		try {
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e) {
			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}